30520872 has 48 divisors (see below), whose sum is σ = 83440500. Its totient is φ = 10077696.

The previous prime is 30520837. The next prime is 30520873. The reversal of 30520872 is 27802503.

It can be written as a sum of positive squares in 2 ways, for example, as 29095236 + 1425636 = 5394^2 + 1194^2 .

It is not an unprimeable number, because it can be changed into a prime (30520873) 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, 5904 + ... + 9792.

Almost surely, 2^30520872 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 30520872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41720250).

30520872 is an abundant number, since it is smaller than the sum of its proper divisors (52919628).

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

30520872 is a wasteful number, since it uses less digits than its factorization.

30520872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4010 (or 4003 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 30520872 is about 5524.5698475085. The cubic root of 30520872 is about 312.5112426889.

The spelling of 30520872 in words is "thirty million, five hundred twenty thousand, eight hundred seventy-two".