30639868 has 24 divisors (see below), whose sum is σ = 61401312. Its totient is φ = 13105344.

The previous prime is 30639853. The next prime is 30639871. The reversal of 30639868 is 86893603.

It is a super-2 number, since 2×30639868² = 1877603022114848, which 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 7 ways as a sum of consecutive naturals, for example, 21630 + ... + 23002.

It is an arithmetic number, because the mean of its divisors is an integer number (2558388).

Almost surely, 2^30639868 is an apocalyptic number.

It is an amenable number.

30639868 is an abundant number, since it is smaller than the sum of its proper divisors (30761444).

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

30639868 is a wasteful number, since it uses less digits than its factorization.

30639868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2181 (or 2179 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 43.

The square root of 30639868 is about 5535.3290778417. The cubic root of 30639868 is about 312.9168597887.

The spelling of 30639868 in words is "thirty million, six hundred thirty-nine thousand, eight hundred sixty-eight".