256155885 has 32 divisors (see below), whose sum is σ = 456698880. Its totient is φ = 136223424.

The previous prime is 256155877. The next prime is 256155901. The reversal of 256155885 is 588551652.

256155885 is a `hidden beast` number, since 2 + 5 + 61 + 5 + 588 + 5 = 666.

256155885 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 256155885 - 2³ = 256155877 is a prime.

It is a super-3 number, since 3×256155885³ (a number of 26 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 256155885.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 47812 + ... + 52898.

It is an arithmetic number, because the mean of its divisors is an integer number (14271840).

Almost surely, 2^256155885 is an apocalyptic number.

It is an amenable number.

256155885 is a deficient number, since it is larger than the sum of its proper divisors (200542995).

256155885 is a wasteful number, since it uses less digits than its factorization.

256155885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5474 (or 5468 counting only the distinct ones).

The product of its digits is 480000, while the sum is 45.

The square root of 256155885 is about 16004.8706648945. The cubic root of 256155885 is about 635.0892758932.

The spelling of 256155885 in words is "two hundred fifty-six million, one hundred fifty-five thousand, eight hundred eighty-five".