30970872 has 48 divisors (see below), whose sum is σ = 88817040. Its totient is φ = 9715968.

The previous prime is 30970847. The next prime is 30970873. The reversal of 30970872 is 27807903.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30970873) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11428 + ... + 13875.

It is an arithmetic number, because the mean of its divisors is an integer number (1850355).

Almost surely, 2^30970872 is an apocalyptic number.

It is an amenable number.

30970872 is an abundant number, since it is smaller than the sum of its proper divisors (57846168).

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

30970872 is a wasteful number, since it uses less digits than its factorization.

30970872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25332 (or 25325 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 36.

The square root of 30970872 is about 5565.1479764693. The cubic root of 30970872 is about 314.0396450139.

The spelling of 30970872 in words is "thirty million, nine hundred seventy thousand, eight hundred seventy-two".