256645074 has 32 divisors (see below), whose sum is σ = 590368896. Its totient is φ = 72858240.

The previous prime is 256645069. The next prime is 256645079. The reversal of 256645074 is 470546652.

It is an interprime number because it is at equal distance from previous prime (256645069) and next prime (256645079).

It is not an unprimeable number, because it can be changed into a prime (256645079) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12867 + ... + 26054.

It is an arithmetic number, because the mean of its divisors is an integer number (18449028).

Almost surely, 2^256645074 is an apocalyptic number.

256645074 is an abundant number, since it is smaller than the sum of its proper divisors (333723822).

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

256645074 is a wasteful number, since it uses less digits than its factorization.

256645074 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39090.

The product of its (nonzero) digits is 201600, while the sum is 39.

The square root of 256645074 is about 16020.1458794856. The cubic root of 256645074 is about 635.4933021711.

The spelling of 256645074 in words is "two hundred fifty-six million, six hundred forty-five thousand, seventy-four".