91725538 has 8 divisors (see below), whose sum is σ = 137903040. Its totient is φ = 45757860.

The previous prime is 91725511. The next prime is 91725547. The reversal of 91725538 is 83552719.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 91725538.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51358 + ... + 53113.

It is an arithmetic number, because the mean of its divisors is an integer number (17237880).

Almost surely, 2^91725538 is an apocalyptic number.

91725538 is a deficient number, since it is larger than the sum of its proper divisors (46177502).

91725538 is a wasteful number, since it uses less digits than its factorization.

91725538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104912.

The product of its digits is 75600, while the sum is 40.

The square root of 91725538 is about 9577.3450392058. The cubic root of 91725538 is about 450.9863762533.

The spelling of 91725538 in words is "ninety-one million, seven hundred twenty-five thousand, five hundred thirty-eight".