256540626 has 24 divisors (see below), whose sum is σ = 556989264. Its totient is φ = 85336440.

The previous prime is 256540621. The next prime is 256540657. The reversal of 256540626 is 626045652.

256540626 is a `hidden beast` number, since 2 + 56 + 540 + 62 + 6 = 666.

It is not an unprimeable number, because it can be changed into a prime (256540621) 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, 5676 + ... + 23351.

It is an arithmetic number, because the mean of its divisors is an integer number (23207886).

Almost surely, 2^256540626 is an apocalyptic number.

256540626 is an abundant number, since it is smaller than the sum of its proper divisors (300448638).

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

256540626 is a wasteful number, since it uses less digits than its factorization.

256540626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29526 (or 29523 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 36.

The square root of 256540626 is about 16016.8856523358. The cubic root of 256540626 is about 635.4070806177.

The spelling of 256540626 in words is "two hundred fifty-six million, five hundred forty thousand, six hundred twenty-six".