30977820 has 72 divisors (see below), whose sum is σ = 94859856. Its totient is φ = 8182272.

The previous prime is 30977753. The next prime is 30977831. The reversal of 30977820 is 2877903.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19579 + ... + 21101.

It is an arithmetic number, because the mean of its divisors is an integer number (1317498).

Almost surely, 2^30977820 is an apocalyptic number.

30977820 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30977820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47429928).

30977820 is an abundant number, since it is smaller than the sum of its proper divisors (63882036).

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

30977820 is a wasteful number, since it uses less digits than its factorization.

30977820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1651 (or 1646 counting only the distinct ones).

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

The square root of 30977820 is about 5565.7721836238. The cubic root of 30977820 is about 314.0631271243.

The spelling of 30977820 in words is "thirty million, nine hundred seventy-seven thousand, eight hundred twenty".