97681720 has 32 divisors (see below), whose sum is σ = 221739120. Its totient is φ = 38725120.

The previous prime is 97681687. The next prime is 97681723. The reversal of 97681720 is 2718679.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97681723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6286 + ... + 15325.

Almost surely, 2^97681720 is an apocalyptic number.

It is an amenable number.

97681720 is an abundant number, since it is smaller than the sum of its proper divisors (124057400).

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

97681720 is a wasteful number, since it uses less digits than its factorization.

97681720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21735 (or 21731 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 40.

The square root of 97681720 is about 9883.4062954024. The cubic root of 97681720 is about 460.5439689571.

The spelling of 97681720 in words is "ninety-seven million, six hundred eighty-one thousand, seven hundred twenty".