97721552 has 40 divisors (see below), whose sum is σ = 192937800. Its totient is φ = 47941632.

The previous prime is 97721543. The next prime is 97721557. The reversal of 97721552 is 25512779.

It can be written as a sum of positive squares in 4 ways, for example, as 48497296 + 49224256 = 6964^2 + 7016^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97721557) 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, 238724 + ... + 239132.

It is an arithmetic number, because the mean of its divisors is an integer number (4823445).

Almost surely, 2^97721552 is an apocalyptic number.

It is an amenable number.

97721552 is a deficient number, since it is larger than the sum of its proper divisors (95216248).

97721552 is a wasteful number, since it uses less digits than its factorization.

97721552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 663 (or 657 counting only the distinct ones).

The product of its digits is 44100, while the sum is 38.

The square root of 97721552 is about 9885.4211847549. The cubic root of 97721552 is about 460.6065596325.

The spelling of 97721552 in words is "ninety-seven million, seven hundred twenty-one thousand, five hundred fifty-two".