91268538 has 16 divisors (see below), whose sum is σ = 182640576. Its totient is φ = 30405600.

The previous prime is 91268479. The next prime is 91268579. The reversal of 91268538 is 83586219.

It is a self number, because there is not a number n which added to its sum of digits gives 91268538.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11763 + ... + 17913.

It is an arithmetic number, because the mean of its divisors is an integer number (11415036).

Almost surely, 2^91268538 is an apocalyptic number.

91268538 is an abundant number, since it is smaller than the sum of its proper divisors (91372038).

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

91268538 is a wasteful number, since it uses less digits than its factorization.

91268538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8629.

The product of its digits is 103680, while the sum is 42.

The square root of 91268538 is about 9553.4568612623. The cubic root of 91268538 is about 450.2361525925.

It can be divided in two parts, 91268 and 538, that added together give a triangular number (91806 = T₄₂₈).

The spelling of 91268538 in words is "ninety-one million, two hundred sixty-eight thousand, five hundred thirty-eight".