256531278 has 16 divisors (see below), whose sum is σ = 513349200. Its totient is φ = 85462656.

The previous prime is 256531277. The next prime is 256531313. The reversal of 256531278 is 872135652.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256531277) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 726 + ... + 22662.

It is an arithmetic number, because the mean of its divisors is an integer number (32084325).

Almost surely, 2^256531278 is an apocalyptic number.

256531278 is an abundant number, since it is smaller than the sum of its proper divisors (256817922).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256531278 is a wasteful number, since it uses less digits than its factorization.

256531278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23891.

The product of its digits is 100800, while the sum is 39.

The square root of 256531278 is about 16016.5938326474. The cubic root of 256531278 is about 635.3993627270.

The spelling of 256531278 in words is "two hundred fifty-six million, five hundred thirty-one thousand, two hundred seventy-eight".