30891952 has 80 divisors (see below), whose sum is σ = 75342400. Its totient is φ = 12192768.

The previous prime is 30891947. The next prime is 30891977. The reversal of 30891952 is 25919803.

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, 71128 + ... + 71560.

It is an arithmetic number, because the mean of its divisors is an integer number (941780).

Almost surely, 2^30891952 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 30891952, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37671200).

30891952 is an abundant number, since it is smaller than the sum of its proper divisors (44450448).

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

30891952 is a wasteful number, since it uses less digits than its factorization.

30891952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 475 (or 455 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 37.

The square root of 30891952 is about 5558.0528964737. The cubic root of 30891952 is about 313.7726727635.

It can be divided in two parts, 3089 and 1952, that added together give a square (5041 = 71²).

The spelling of 30891952 in words is "thirty million, eight hundred ninety-one thousand, nine hundred fifty-two".