97921564 has 24 divisors (see below), whose sum is σ = 195401808. Its totient is φ = 42535680.

The previous prime is 97921561. The next prime is 97921589. The reversal of 97921564 is 46512979.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 97921564.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97921561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54502 + ... + 56269.

It is an arithmetic number, because the mean of its divisors is an integer number (8141742).

Almost surely, 2^97921564 is an apocalyptic number.

It is an amenable number.

97921564 is a deficient number, since it is larger than the sum of its proper divisors (97480244).

97921564 is a wasteful number, since it uses less digits than its factorization.

97921564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110805 (or 110803 counting only the distinct ones).

The product of its digits is 136080, while the sum is 43.

The square root of 97921564 is about 9895.5325273580. The cubic root of 97921564 is about 460.9205949537.

The spelling of 97921564 in words is "ninety-seven million, nine hundred twenty-one thousand, five hundred sixty-four".