30639912 has 32 divisors (see below), whose sum is σ = 76735680. Its totient is φ = 10195200.

The previous prime is 30639877. The next prime is 30639919. The reversal of 30639912 is 21993603.

It is not an unprimeable number, because it can be changed into a prime (30639919) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24912 + ... + 26112.

It is an arithmetic number, because the mean of its divisors is an integer number (2397990).

Almost surely, 2^30639912 is an apocalyptic number.

It is an amenable number.

30639912 is an abundant number, since it is smaller than the sum of its proper divisors (46095768).

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

30639912 is a wasteful number, since it uses less digits than its factorization.

30639912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2273 (or 2269 counting only the distinct ones).

The product of its (nonzero) digits is 8748, while the sum is 33.

The square root of 30639912 is about 5535.3330523104. Note that the first 3 decimals coincide. The cubic root of 30639912 is about 312.9170095755.

The spelling of 30639912 in words is "thirty million, six hundred thirty-nine thousand, nine hundred twelve".