30997680 has 80 divisors (see below), whose sum is σ = 109826304. Its totient is φ = 7084800.

The previous prime is 30997679. The next prime is 30997691. The reversal of 30997680 is 8679903.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (42).

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, 7546 + ... + 10905.

Almost surely, 2^30997680 is an apocalyptic number.

30997680 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

30997680 is an abundant number, since it is smaller than the sum of its proper divisors (78828624).

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

30997680 is a wasteful number, since it uses less digits than its factorization.

30997680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18474 (or 18468 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 42.

The square root of 30997680 is about 5567.5560167815. The cubic root of 30997680 is about 314.1302284812.

The spelling of 30997680 in words is "thirty million, nine hundred ninety-seven thousand, six hundred eighty".