30997620 has 96 divisors (see below), whose sum is σ = 97372800. Its totient is φ = 8186112.

The previous prime is 30997573. The next prime is 30997627. The reversal of 30997620 is 2679903.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30997627) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 73771 + ... + 74189.

It is an arithmetic number, because the mean of its divisors is an integer number (1014300).

Almost surely, 2^30997620 is an apocalyptic number.

30997620 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 30997620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48686400).

30997620 is an abundant number, since it is smaller than the sum of its proper divisors (66375180).

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

30997620 is a wasteful number, since it uses less digits than its factorization.

30997620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 574 (or 566 counting only the distinct ones).

The product of its (nonzero) digits is 20412, while the sum is 36.

The square root of 30997620 is about 5567.5506284182. The cubic root of 30997620 is about 314.1300258012.

The spelling of 30997620 in words is "thirty million, nine hundred ninety-seven thousand, six hundred twenty".