91664870 has 32 divisors (see below), whose sum is σ = 180838656. Its totient is φ = 33176800.

The previous prime is 91664869. The next prime is 91664879. The reversal of 91664870 is 7846619.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91664879) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23135 + ... + 26805.

It is an arithmetic number, because the mean of its divisors is an integer number (5651208).

Almost surely, 2^91664870 is an apocalyptic number.

91664870 is a deficient number, since it is larger than the sum of its proper divisors (89173786).

91664870 is a wasteful number, since it uses less digits than its factorization.

91664870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3916.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 91664870 is about 9574.1772492471. The cubic root of 91664870 is about 450.8869256661.

The spelling of 91664870 in words is "ninety-one million, six hundred sixty-four thousand, eight hundred seventy".