91745790 has 16 divisors (see below), whose sum is σ = 220189968. Its totient is φ = 24465536.

The previous prime is 91745779. The next prime is 91745803. The reversal of 91745790 is 9754719.

It is a happy number.

It is a congruent number.

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, 1529067 + ... + 1529126.

It is an arithmetic number, because the mean of its divisors is an integer number (13761873).

Almost surely, 2^91745790 is an apocalyptic number.

91745790 is an abundant number, since it is smaller than the sum of its proper divisors (128444178).

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

91745790 is a wasteful number, since it uses less digits than its factorization.

91745790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3058203.

The product of its (nonzero) digits is 79380, while the sum is 42.

The square root of 91745790 is about 9578.4022676018. The cubic root of 91745790 is about 451.0195647712.

The spelling of 91745790 in words is "ninety-one million, seven hundred forty-five thousand, seven hundred ninety".