91995664 has 10 divisors (see below), whose sum is σ = 178241630. Its totient is φ = 45997824.

The previous prime is 91995661. The next prime is 91995689. The reversal of 91995664 is 46659919.

It can be written as a sum of positive squares in only one way, i.e., 91011600 + 984064 = 9540^2 + 992^2 .

It is not an unprimeable number, because it can be changed into a prime (91995661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2874849 + ... + 2874880.

It is an arithmetic number, because the mean of its divisors is an integer number (17824163).

Almost surely, 2^91995664 is an apocalyptic number.

It is an amenable number.

91995664 is a deficient number, since it is larger than the sum of its proper divisors (86245966).

91995664 is a wasteful number, since it uses less digits than its factorization.

91995664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5749737 (or 5749731 counting only the distinct ones).

The product of its digits is 524880, while the sum is 49.

The square root of 91995664 is about 9591.4370143373. The cubic root of 91995664 is about 451.4286513150.

The spelling of 91995664 in words is "ninety-one million, nine hundred ninety-five thousand, six hundred sixty-four".