256716620 has 12 divisors (see below), whose sum is σ = 539104944. Its totient is φ = 102686640.

The previous prime is 256716601. The next prime is 256716623. The reversal of 256716620 is 26617652.

It is not an unprimeable number, because it can be changed into a prime (256716623) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6417896 + ... + 6417935.

It is an arithmetic number, because the mean of its divisors is an integer number (44925412).

Almost surely, 2^256716620 is an apocalyptic number.

256716620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256716620 is an abundant number, since it is smaller than the sum of its proper divisors (282388324).

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

256716620 is a wasteful number, since it uses less digits than its factorization.

256716620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12835840 (or 12835838 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 256716620 is about 16022.3787247712. The cubic root of 256716620 is about 635.5523497093.

The spelling of 256716620 in words is "two hundred fifty-six million, seven hundred sixteen thousand, six hundred twenty".