256632938 has 4 divisors (see below), whose sum is σ = 384949410. Its totient is φ = 128316468.

The previous prime is 256632931. The next prime is 256632941. The reversal of 256632938 is 839236652.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 190909489 + 65723449 = 13817^2 + 8107^2 .

It is not an unprimeable number, because it can be changed into a prime (256632931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64158233 + ... + 64158236.

Almost surely, 2^256632938 is an apocalyptic number.

256632938 is a deficient number, since it is larger than the sum of its proper divisors (128316472).

256632938 is a wasteful number, since it uses less digits than its factorization.

256632938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128316471.

The product of its digits is 466560, while the sum is 44.

The square root of 256632938 is about 16019.7671019275. The cubic root of 256632938 is about 635.4832851358.

The spelling of 256632938 in words is "two hundred fifty-six million, six hundred thirty-two thousand, nine hundred thirty-eight".