| Base | Representation |
|---|---|
| bin | 11110100010110… |
| … | …10000000111000 |
| 3 | 122212010101110120 |
| 4 | 33101122000320 |
| 5 | 1011043034430 |
| 6 | 41231413240 |
| 7 | 6230562462 |
| oct | 1721320070 |
| 9 | 585111416 |
| 10 | 256221240 |
| 11 | 1216a28a0 |
| 12 | 71984220 |
| 13 | 41110302 |
| 14 | 26059132 |
| 15 | 17762610 |
| hex | f45a038 |
256221240 has 128 divisors (see below), whose sum is σ = 850348800. Its totient is φ = 61240320.
The previous prime is 256221233. The next prime is 256221241. The reversal of 256221240 is 42122652.
It is a happy number.
It is a Harshad number since it is a multiple of its sum of digits (24).
It is a self number, because there is not a number n which added to its sum of digits gives 256221240.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (256221241) by changing a digit.
It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 95031 + ... + 97689.
It is an arithmetic number, because the mean of its divisors is an integer number (6643350).
Almost surely, 2256221240 is an apocalyptic number.
256221240 is a gapful number since it is divisible by the number (20) 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 256221240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (425174400).
256221240 is an abundant number, since it is smaller than the sum of its proper divisors (594127560).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
256221240 is a wasteful number, since it uses less digits than its factorization.
256221240 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 2757 (or 2753 counting only the distinct ones).
The product of its (nonzero) digits is 1920, while the sum is 24.
The square root of 256221240 is about 16006.9122568970. The cubic root of 256221240 is about 635.1432830201.
Adding to 256221240 its reverse (42122652), we get a palindrome (298343892).
It can be divided in two parts, 25622 and 1240, that added together give a palindrome (26862).
The spelling of 256221240 in words is "two hundred fifty-six million, two hundred twenty-one thousand, two hundred forty".
• e-mail: info -at- numbersaplenty.com • Privacy notice • done in 0.080 sec. • engine limits •