30791220 has 48 divisors (see below), whose sum is σ = 86694720. Its totient is φ = 8165376.

The previous prime is 30791213. The next prime is 30791221. The reversal of 30791220 is 2219703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30791221) 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, 10251 + ... + 12909.

It is an arithmetic number, because the mean of its divisors is an integer number (1806140).

Almost surely, 2^30791220 is an apocalyptic number.

30791220 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

30791220 is an abundant number, since it is smaller than the sum of its proper divisors (55903500).

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

30791220 is a wasteful number, since it uses less digits than its factorization.

30791220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2864 (or 2862 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 24.

The square root of 30791220 is about 5548.9836907311. The cubic root of 30791220 is about 313.4312530336.

The spelling of 30791220 in words is "thirty million, seven hundred ninety-one thousand, two hundred twenty".