91787965 has 8 divisors (see below), whose sum is σ = 110217528. Its totient is φ = 73382400.

The previous prime is 91787959. The next prime is 91787977. The reversal of 91787965 is 56978719.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 4571044 + 87216921 = 2138^2 + 9339^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 91787965 - 2⁵ = 91787933 is a prime.

It is a Duffinian number.

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, 3909 + ... + 14101.

It is an arithmetic number, because the mean of its divisors is an integer number (13777191).

Almost surely, 2^91787965 is an apocalyptic number.

It is an amenable number.

91787965 is a deficient number, since it is larger than the sum of its proper divisors (18429563).

91787965 is a wasteful number, since it uses less digits than its factorization.

91787965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11999.

The product of its digits is 952560, while the sum is 52.

The square root of 91787965 is about 9580.6035822384. The cubic root of 91787965 is about 451.0886645310.

The spelling of 91787965 in words is "ninety-one million, seven hundred eighty-seven thousand, nine hundred sixty-five".