91285864 has 8 divisors (see below), whose sum is σ = 171161010. Its totient is φ = 45642928.

The previous prime is 91285841. The next prime is 91285867. The reversal of 91285864 is 46858219.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 84824100 + 6461764 = 9210^2 + 2542^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 91285864.

It is not an unprimeable number, because it can be changed into a prime (91285867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5705359 + ... + 5705374.

Almost surely, 2^91285864 is an apocalyptic number.

It is an amenable number.

91285864 is a deficient number, since it is larger than the sum of its proper divisors (79875146).

91285864 is a wasteful number, since it uses less digits than its factorization.

91285864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11410739 (or 11410735 counting only the distinct ones).

The product of its digits is 138240, while the sum is 43.

The square root of 91285864 is about 9554.3636104138. The cubic root of 91285864 is about 450.2646410442.

The spelling of 91285864 in words is "ninety-one million, two hundred eighty-five thousand, eight hundred sixty-four".