| Base | Representation |
|---|---|
| bin | 1001010101111… |
| … | …11110000001000 |
| 3 | 12110111010012110 |
| 4 | 10222333300020 |
| 5 | 130031130130 |
| 6 | 11435542320 |
| 7 | 1641135144 |
| oct | 452776010 |
| 9 | 173433173 |
| 10 | 78380040 |
| 11 | 402750a2 |
| 12 | 222ba9a0 |
| 13 | 13313c2b |
| 14 | a5a4224 |
| 15 | 6d33ab0 |
| hex | 4abfc08 |
78380040 has 128 divisors (see below), whose sum is σ = 246758400. Its totient is φ = 19891200.
The previous prime is 78380039. The next prime is 78380041. The reversal of 78380040 is 4008387.
78380040 = 1142 + 1152 + ... + 6182.
It is an interprime number because it is at equal distance from previous prime (78380039) and next prime (78380041).
It is a super-2 number, since 2×783800402 = 12286861340803200, which contains 22 as substring.
It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.
It is a Harshad number since it is a multiple of its sum of digits (30).
It is not an unprimeable number, because it can be changed into a prime (78380041) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 351369 + ... + 351591.
It is an arithmetic number, because the mean of its divisors is an integer number (1927800).
Almost surely, 278380040 is an apocalyptic number.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 78380040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (123379200).
78380040 is an abundant number, since it is smaller than the sum of its proper divisors (168378360).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
78380040 is a wasteful number, since it uses less digits than its factorization.
78380040 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 367 (or 363 counting only the distinct ones).
The product of its (nonzero) digits is 5376, while the sum is 30.
The square root of 78380040 is about 8853.2502506142. The cubic root of 78380040 is about 427.9586677995.
The spelling of 78380040 in words is "seventy-eight million, three hundred eighty thousand, forty".
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