91897568 has 24 divisors (see below), whose sum is σ = 206770032. Its totient is φ = 39384576.

The previous prime is 91897567. The next prime is 91897591. The reversal of 91897568 is 86579819.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91897567) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 204905 + ... + 205352.

It is an arithmetic number, because the mean of its divisors is an integer number (8615418).

Almost surely, 2^91897568 is an apocalyptic number.

It is an amenable number.

91897568 is an abundant number, since it is smaller than the sum of its proper divisors (114872464).

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

91897568 is a wasteful number, since it uses less digits than its factorization.

91897568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410274 (or 410266 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 53.

The square root of 91897568 is about 9586.3219224059. The cubic root of 91897568 is about 451.2681397854.

The spelling of 91897568 in words is "ninety-one million, eight hundred ninety-seven thousand, five hundred sixty-eight".