656663388 has 24 divisors (see below), whose sum is σ = 1532993280. Its totient is φ = 218776560.

The previous prime is 656663341. The next prime is 656663407. The reversal of 656663388 is 883366656.

It is a self number, because there is not a number n which added to its sum of digits gives 656663388.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12733 + ... + 38411.

It is an arithmetic number, because the mean of its divisors is an integer number (63874720).

Almost surely, 2^656663388 is an apocalyptic number.

It is an amenable number.

656663388 is an abundant number, since it is smaller than the sum of its proper divisors (876329892).

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

656663388 is a wasteful number, since it uses less digits than its factorization.

656663388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27817 (or 27815 counting only the distinct ones).

The product of its digits is 3732480, while the sum is 51.

The square root of 656663388 is about 25625.4441522484. Note that the first 3 decimals coincide. The cubic root of 656663388 is about 869.1890924705.

The spelling of 656663388 in words is "six hundred fifty-six million, six hundred sixty-three thousand, three hundred eighty-eight".