256787925 has 12 divisors (see below), whose sum is σ = 424556160. Its totient is φ = 136953520.

The previous prime is 256787897. The next prime is 256787929. The reversal of 256787925 is 529787652.

It is not a de Polignac number, because 256787925 - 2²⁰ = 255739349 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256787929) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1711845 + ... + 1711994.

It is an arithmetic number, because the mean of its divisors is an integer number (35379680).

Almost surely, 2^256787925 is an apocalyptic number.

256787925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

256787925 is a deficient number, since it is larger than the sum of its proper divisors (167768235).

256787925 is a wasteful number, since it uses less digits than its factorization.

256787925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3423852 (or 3423847 counting only the distinct ones).

The product of its digits is 2116800, while the sum is 51.

The square root of 256787925 is about 16024.6037392505. The cubic root of 256787925 is about 635.6111874336.

The spelling of 256787925 in words is "two hundred fifty-six million, seven hundred eighty-seven thousand, nine hundred twenty-five".