91087764 has 24 divisors (see below), whose sum is σ = 212704128. Its totient is φ = 30338880.

The previous prime is 91087757. The next prime is 91087771. The reversal of 91087764 is 46778019.

It is an interprime number because it is at equal distance from previous prime (91087757) and next prime (91087771).

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, 20424 + ... + 24480.

It is an arithmetic number, because the mean of its divisors is an integer number (8862672).

Almost surely, 2^91087764 is an apocalyptic number.

It is an amenable number.

91087764 is an abundant number, since it is smaller than the sum of its proper divisors (121616364).

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

91087764 is a wasteful number, since it uses less digits than its factorization.

91087764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5935 (or 5933 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 42.

The square root of 91087764 is about 9543.9909890988. The cubic root of 91087764 is about 449.9386978222.

The spelling of 91087764 in words is "ninety-one million, eighty-seven thousand, seven hundred sixty-four".