656580460 has 48 divisors (see below), whose sum is σ = 1462968864. Its totient is φ = 246668288.

The previous prime is 656580451. The next prime is 656580479. The reversal of 656580460 is 64085656.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 187647 + ... + 191113.

It is an arithmetic number, because the mean of its divisors is an integer number (30478518).

Almost surely, 2^656580460 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 656580460, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (731484432).

656580460 is an abundant number, since it is smaller than the sum of its proper divisors (806388404).

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

656580460 is a wasteful number, since it uses less digits than its factorization.

656580460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4050 (or 4048 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 40.

The square root of 656580460 is about 25623.8260218883. The cubic root of 656580460 is about 869.1525018576.

It can be divided in two parts, 6565 and 80460, that added together give a square (87025 = 295²).

The spelling of 656580460 in words is "six hundred fifty-six million, five hundred eighty thousand, four hundred sixty".