256238580 has 48 divisors (see below), whose sum is σ = 772660224. Its totient is φ = 63073920.

The previous prime is 256238539. The next prime is 256238597. The reversal of 256238580 is 85832652.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 163476 + ... + 165035.

It is an arithmetic number, because the mean of its divisors is an integer number (16097088).

Almost surely, 2^256238580 is an apocalyptic number.

256238580 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256238580 is an abundant number, since it is smaller than the sum of its proper divisors (516421644).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256238580 is a wasteful number, since it uses less digits than its factorization.

256238580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328536 (or 328534 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 39.

The square root of 256238580 is about 16007.4538887357. The cubic root of 256238580 is about 635.1576106589.

The spelling of 256238580 in words is "two hundred fifty-six million, two hundred thirty-eight thousand, five hundred eighty".