256740736 has 32 divisors (see below), whose sum is σ = 584545680. Its totient is φ = 110031360.

The previous prime is 256740727. The next prime is 256740739. The reversal of 256740736 is 637047652.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256740739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142375 + ... + 144166.

Almost surely, 2^256740736 is an apocalyptic number.

It is an amenable number.

256740736 is an abundant number, since it is smaller than the sum of its proper divisors (327804944).

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

256740736 is an equidigital number, since it uses as much as digits as its factorization.

256740736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286562 (or 286550 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 40.

The square root of 256740736 is about 16023.1312794972. The cubic root of 256740736 is about 635.5722503824.

The spelling of 256740736 in words is "two hundred fifty-six million, seven hundred forty thousand, seven hundred thirty-six".