91928665 has 4 divisors (see below), whose sum is σ = 110314404. Its totient is φ = 73542928.

The previous prime is 91928653. The next prime is 91928689. The reversal of 91928665 is 56682919.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56682919 = 283 ⋅200293.

It can be written as a sum of positive squares in 2 ways, for example, as 13995081 + 77933584 = 3741^2 + 8828^2 .

It is a cyclic number.

It is not a de Polignac number, because 91928665 - 2⁹ = 91928153 is a prime.

It is a Duffinian 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, 9192862 + ... + 9192871.

It is an arithmetic number, because the mean of its divisors is an integer number (27578601).

Almost surely, 2^91928665 is an apocalyptic number.

It is an amenable number.

91928665 is a deficient number, since it is larger than the sum of its proper divisors (18385739).

91928665 is a wasteful number, since it uses less digits than its factorization.

91928665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18385738.

The product of its digits is 233280, while the sum is 46.

The square root of 91928665 is about 9587.9437315829. The cubic root of 91928665 is about 451.3190352300.

It can be divided in two parts, 919 and 28665, that added together give a square (29584 = 172²).

The spelling of 91928665 in words is "ninety-one million, nine hundred twenty-eight thousand, six hundred sixty-five".