256818136 has 32 divisors (see below), whose sum is σ = 523238400. Its totient is φ = 117724320.

The previous prime is 256818103. The next prime is 256818139. The reversal of 256818136 is 631818652.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256818139) 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, 22540 + ... + 31963.

It is an arithmetic number, because the mean of its divisors is an integer number (16351200).

Almost surely, 2^256818136 is an apocalyptic number.

It is an amenable number.

256818136 is an abundant number, since it is smaller than the sum of its proper divisors (266420264).

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

256818136 is a wasteful number, since it uses less digits than its factorization.

256818136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54559 (or 54555 counting only the distinct ones).

The product of its digits is 69120, while the sum is 40.

The square root of 256818136 is about 16025.5463557409. The cubic root of 256818136 is about 635.6361129262.

The spelling of 256818136 in words is "two hundred fifty-six million, eight hundred eighteen thousand, one hundred thirty-six".