30640982868 has 36 divisors (see below), whose sum is σ = 78220472148. Its totient is φ = 10112534400.

The previous prime is 30640982851. The next prime is 30640982891. The reversal of 30640982868 is 86828904603.

It can be written as a sum of positive squares in 2 ways, for example, as 20482761924 + 10158220944 = 143118^2 + 100788^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×30640982868² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4209921 + ... + 4217192.

It is an arithmetic number, because the mean of its divisors is an integer number (2172790893).

Almost surely, 2^30640982868 is an apocalyptic number.

It is an amenable number.

30640982868 is an abundant number, since it is smaller than the sum of its proper divisors (47579489280).

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

30640982868 is a wasteful number, since it uses less digits than its factorization.

30640982868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8427224 (or 8427219 counting only the distinct ones).

The product of its (nonzero) digits is 3981312, while the sum is 54.

The spelling of 30640982868 in words is "thirty billion, six hundred forty million, nine hundred eighty-two thousand, eight hundred sixty-eight".