617868656 has 20 divisors (see below), whose sum is σ = 1203329232. Its totient is φ = 307332096.

The previous prime is 617868653. The next prime is 617868697. The reversal of 617868656 is 656868716.

It is a junction number, because it is equal to n+sod(n) for n = 617868598 and 617868607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (617868653) 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, 96956 + ... + 103131.

Almost surely, 2^617868656 is an apocalyptic number.

It is an amenable number.

617868656 is a deficient number, since it is larger than the sum of its proper divisors (585460576).

617868656 is a wasteful number, since it uses less digits than its factorization.

617868656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200288 (or 200282 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 53.

The square root of 617868656 is about 24856.9639336746. The cubic root of 617868656 is about 851.7236791928.

The spelling of 617868656 in words is "six hundred seventeen million, eight hundred sixty-eight thousand, six hundred fifty-six".