91745872 has 20 divisors (see below), whose sum is σ = 188214516. Its totient is φ = 43174400.

The previous prime is 91745869. The next prime is 91745881. The reversal of 91745872 is 27854719.

It can be written as a sum of positive squares in 2 ways, for example, as 58614336 + 33131536 = 7656^2 + 5756^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 168379 + ... + 168922.

Almost surely, 2^91745872 is an apocalyptic number.

It is an amenable number.

91745872 is an abundant number, since it is smaller than the sum of its proper divisors (96468644).

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

91745872 is a wasteful number, since it uses less digits than its factorization.

91745872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337326 (or 337320 counting only the distinct ones).

The product of its digits is 141120, while the sum is 43.

The square root of 91745872 is about 9578.4065480642. The cubic root of 91745872 is about 451.0196991410.

The spelling of 91745872 in words is "ninety-one million, seven hundred forty-five thousand, eight hundred seventy-two".