30664393938 has 32 divisors (see below), whose sum is σ = 70341265920. Its totient is φ = 9891739440.

The previous prime is 30664393919. The next prime is 30664393973. The reversal of 30664393938 is 83939346603.

It is a super-2 number, since 2×30664393938² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9157345 + ... + 9160692.

It is an arithmetic number, because the mean of its divisors is an integer number (2198164560).

Almost surely, 2^30664393938 is an apocalyptic number.

30664393938 is an abundant number, since it is smaller than the sum of its proper divisors (39676871982).

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

30664393938 is a wasteful number, since it uses less digits than its factorization.

30664393938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18318079 (or 18318073 counting only the distinct ones).

The product of its (nonzero) digits is 7558272, while the sum is 54.

The spelling of 30664393938 in words is "thirty billion, six hundred sixty-four million, three hundred ninety-three thousand, nine hundred thirty-eight".