256625187 has 16 divisors (see below), whose sum is σ = 421128960. Its totient is φ = 135362592.

The previous prime is 256625113. The next prime is 256625189. The reversal of 256625187 is 781526652.

It is not a de Polignac number, because 256625187 - 2⁸ = 256624931 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256625189) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 469737 + ... + 470282.

It is an arithmetic number, because the mean of its divisors is an integer number (26320560).

Almost surely, 2^256625187 is an apocalyptic number.

256625187 is a deficient number, since it is larger than the sum of its proper divisors (164503773).

256625187 is a wasteful number, since it uses less digits than its factorization.

256625187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 940042.

The product of its digits is 201600, while the sum is 42.

The square root of 256625187 is about 16019.5251802293. The cubic root of 256625187 is about 635.4768873074.

The spelling of 256625187 in words is "two hundred fifty-six million, six hundred twenty-five thousand, one hundred eighty-seven".