656444880 has 480 divisors, whose sum is σ = 2788321536. Its totient is φ = 134701056.

The previous prime is 656444879. The next prime is 656444897. The reversal of 656444880 is 88444656.

656444880 is a `hidden beast` number, since 6 + 564 + 4 + 4 + 8 + 80 = 666.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2817244 + ... + 2817476.

Almost surely, 2^656444880 is an apocalyptic number.

656444880 is a gapful number since it is divisible by the number (60) 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 656444880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1394160768).

656444880 is an abundant number, since it is smaller than the sum of its proper divisors (2131876656).

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

656444880 is a wasteful number, since it uses less digits than its factorization.

656444880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315 (or 306 counting only the distinct ones).

The product of its (nonzero) digits is 737280, while the sum is 45.

The square root of 656444880 is about 25621.1803006809. The cubic root of 656444880 is about 869.0926727809.

The spelling of 656444880 in words is "six hundred fifty-six million, four hundred forty-four thousand, eight hundred eighty".