256664520 has 192 divisors, whose sum is σ = 960336000. Its totient is φ = 58235904.

The previous prime is 256664491. The next prime is 256664543. The reversal of 256664520 is 25466652.

256664520 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 450796 + ... + 451364.

It is an arithmetic number, because the mean of its divisors is an integer number (5001750).

Almost surely, 2^256664520 is an apocalyptic number.

256664520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 256664520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (480168000).

256664520 is an abundant number, since it is smaller than the sum of its proper divisors (703671480).

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

256664520 is a wasteful number, since it uses less digits than its factorization.

256664520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 772 (or 765 counting only the distinct ones).

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

The square root of 256664520 is about 16020.7527913017. The cubic root of 256664520 is about 635.5093522105.

The spelling of 256664520 in words is "two hundred fifty-six million, six hundred sixty-four thousand, five hundred twenty".