97221564 has 72 divisors (see below), whose sum is σ = 270444720. Its totient is φ = 29446560.

The previous prime is 97221541. The next prime is 97221571. The reversal of 97221564 is 46512279.

97221564 is a `hidden beast` number, since 9 + 72 + 21 + 564 = 666.

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, 46902 + ... + 48930.

Almost surely, 2^97221564 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 97221564, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (135222360).

97221564 is an abundant number, since it is smaller than the sum of its proper divisors (173223156).

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

97221564 is a wasteful number, since it uses less digits than its factorization.

97221564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2072 (or 2045 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 97221564 is about 9860.0995938175. The cubic root of 97221564 is about 459.8196583553.

It can be divided in two parts, 972215 and 64, that added together give a palindrome (972279).

The spelling of 97221564 in words is "ninety-seven million, two hundred twenty-one thousand, five hundred sixty-four".