30778980660 has 72 divisors (see below), whose sum is σ = 93989586600. Its totient is φ = 8152635648.

The previous prime is 30778980653. The next prime is 30778980679. The reversal of 30778980660 is 6608987703.

It can be written as a sum of positive squares in 4 ways, for example, as 2488413456 + 28290567204 = 49884^2 + 168198^2 .

It is a junction number, because it is equal to n+sod(n) for n = 30778980597 and 30778980606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 546987 + ... + 600626.

It is an arithmetic number, because the mean of its divisors is an integer number (1305410925).

Almost surely, 2^30778980660 is an apocalyptic number.

30778980660 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

30778980660 is an abundant number, since it is smaller than the sum of its proper divisors (63210605940).

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

30778980660 is a wasteful number, since it uses less digits than its factorization.

30778980660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1147777 (or 1147772 counting only the distinct ones).

The product of its (nonzero) digits is 3048192, while the sum is 54.

The spelling of 30778980660 in words is "thirty billion, seven hundred seventy-eight million, nine hundred eighty thousand, six hundred sixty".