256620642 has 16 divisors (see below), whose sum is σ = 519009120. Its totient is φ = 84578912.

The previous prime is 256620629. The next prime is 256620709. The reversal of 256620642 is 246026652.

It is a super-3 number, since 3×256620642³ (a number of 26 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 239748 + ... + 240815.

It is an arithmetic number, because the mean of its divisors is an integer number (32438070).

Almost surely, 2^256620642 is an apocalyptic number.

256620642 is an abundant number, since it is smaller than the sum of its proper divisors (262388478).

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

256620642 is a wasteful number, since it uses less digits than its factorization.

256620642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 480657.

The product of its (nonzero) digits is 34560, while the sum is 33.

The square root of 256620642 is about 16019.3833214640. The cubic root of 256620642 is about 635.4731357147.

The spelling of 256620642 in words is "two hundred fifty-six million, six hundred twenty thousand, six hundred forty-two".