30920785656 has 16 divisors (see below), whose sum is σ = 77301964200. Its totient is φ = 10306928544.

The previous prime is 30920785639. The next prime is 30920785657. The reversal of 30920785656 is 65658702903.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 30920785599 and 30920785608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30920785657) 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, 644183011 + ... + 644183058.

Almost surely, 2^30920785656 is an apocalyptic number.

It is an amenable number.

30920785656 is an abundant number, since it is smaller than the sum of its proper divisors (46381178544).

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

30920785656 is a wasteful number, since it uses less digits than its factorization.

30920785656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1288366078 (or 1288366074 counting only the distinct ones).

The product of its (nonzero) digits is 2721600, while the sum is 51.

The spelling of 30920785656 in words is "thirty billion, nine hundred twenty million, seven hundred eighty-five thousand, six hundred fifty-six".