| Base | Representation |
|---|---|
| bin | 11101010100001111… |
| … | …101000100001110100 |
| 3 | 10000020202200222100200 |
| 4 | 131110033220201310 |
| 5 | 1003431401433010 |
| 6 | 22243314040500 |
| 7 | 2163025622520 |
| oct | 352417504164 |
| 9 | 100222628320 |
| 10 | 31478155380 |
| 11 | 12393664051 |
| 12 | 6125b79130 |
| 13 | 2c786a9459 |
| 14 | 17488a2d80 |
| 15 | c437aacc0 |
| hex | 7543e8874 |
31478155380 has 288 divisors, whose sum is σ = 117039686400. Its totient is φ = 6687442944.
The previous prime is 31478155351. The next prime is 31478155381. The reversal of 31478155380 is 8355187413.
It is a happy number.
31478155380 is a `hidden beast` number, since 3 + 14 + 7 + 8 + 1 + 553 + 80 = 666.
It is a super-3 number, since 3×314781553803 (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.
It is a Harshad number since it is a multiple of its sum of digits (45).
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (31478155381) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (17) of ones.
It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1256416 + ... + 1281224.
It is an arithmetic number, because the mean of its divisors is an integer number (406387800).
Almost surely, 231478155380 is an apocalyptic number.
31478155380 is a gapful number since it is divisible by the number (30) formed by its first and last digit.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 31478155380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (58519843200).
31478155380 is an abundant number, since it is smaller than the sum of its proper divisors (85561531020).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
31478155380 is a wasteful number, since it uses less digits than its factorization.
31478155380 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 24903 (or 24898 counting only the distinct ones).
The product of its (nonzero) digits is 403200, while the sum is 45.
The spelling of 31478155380 in words is "thirty-one billion, four hundred seventy-eight million, one hundred fifty-five thousand, three hundred eighty".
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