97641728 has 18 divisors (see below), whose sum is σ = 194902554. Its totient is φ = 48820736.

The previous prime is 97641721. The next prime is 97641743. The reversal of 97641728 is 82714679.

It can be written as a sum of positive squares in only one way, i.e., 71098624 + 26543104 = 8432^2 + 5152^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97641721) 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 as a sum of consecutive naturals, namely, 190451 + ... + 190962.

Almost surely, 2^97641728 is an apocalyptic number.

It is an amenable number.

97641728 is a deficient number, since it is larger than the sum of its proper divisors (97260826).

97641728 is an equidigital number, since it uses as much as digits as its factorization.

97641728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381429 (or 381415 counting only the distinct ones).

The product of its digits is 169344, while the sum is 44.

The square root of 97641728 is about 9881.3828991695. The cubic root of 97641728 is about 460.4811097428.

The spelling of 97641728 in words is "ninety-seven million, six hundred forty-one thousand, seven hundred twenty-eight".