30972732 has 48 divisors (see below), whose sum is σ = 83741952. Its totient is φ = 8726400.

The previous prime is 30972731. The next prime is 30972757. The reversal of 30972732 is 23727903.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 30972693 and 30972702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30972731) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3607 + ... + 8657.

It is an arithmetic number, because the mean of its divisors is an integer number (1744624).

Almost surely, 2^30972732 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30972732, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41870976).

30972732 is an abundant number, since it is smaller than the sum of its proper divisors (52769220).

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

30972732 is a wasteful number, since it uses less digits than its factorization.

30972732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5138 (or 5136 counting only the distinct ones).

The product of its (nonzero) digits is 15876, while the sum is 33.

The square root of 30972732 is about 5565.3150854197. The cubic root of 30972732 is about 314.0459315880.

The spelling of 30972732 in words is "thirty million, nine hundred seventy-two thousand, seven hundred thirty-two".