91215064 has 32 divisors (see below), whose sum is σ = 185993280. Its totient is φ = 41762304.

The previous prime is 91215053. The next prime is 91215097. The reversal of 91215064 is 46051219.

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, 4032 + ... + 14095.

It is an arithmetic number, because the mean of its divisors is an integer number (5812290).

Almost surely, 2^91215064 is an apocalyptic number.

It is an amenable number.

91215064 is an abundant number, since it is smaller than the sum of its proper divisors (94778216).

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

91215064 is a wasteful number, since it uses less digits than its factorization.

91215064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18187 (or 18183 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 91215064 is about 9550.6577783941. The cubic root of 91215064 is about 450.1482046823.

The spelling of 91215064 in words is "ninety-one million, two hundred fifteen thousand, sixty-four".