256497188 has 12 divisors (see below), whose sum is σ = 472494960. Its totient is φ = 121498632.

The previous prime is 256497187. The next prime is 256497211. The reversal of 256497188 is 881794652.

256497188 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (256497187) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1687406 + ... + 1687557.

It is an arithmetic number, because the mean of its divisors is an integer number (39374580).

Almost surely, 2^256497188 is an apocalyptic number.

It is an amenable number.

256497188 is a deficient number, since it is larger than the sum of its proper divisors (215997772).

256497188 is a wasteful number, since it uses less digits than its factorization.

256497188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3374986 (or 3374984 counting only the distinct ones).

The product of its digits is 967680, while the sum is 50.

The square root of 256497188 is about 16015.5295884963. The cubic root of 256497188 is about 635.3712157709.

The spelling of 256497188 in words is "two hundred fifty-six million, four hundred ninety-seven thousand, one hundred eighty-eight".