91880765 has 8 divisors (see below), whose sum is σ = 110312280. Its totient is φ = 73467712.

The previous prime is 91880749. The next prime is 91880773. The reversal of 91880765 is 56708819.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 24870169 + 67010596 = 4987^2 + 8186^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 91880765 - 2⁴ = 91880749 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11387 + ... + 17703.

It is an arithmetic number, because the mean of its divisors is an integer number (13789035).

Almost surely, 2^91880765 is an apocalyptic number.

It is an amenable number.

91880765 is a deficient number, since it is larger than the sum of its proper divisors (18431515).

91880765 is a wasteful number, since it uses less digits than its factorization.

91880765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9231.

The product of its (nonzero) digits is 120960, while the sum is 44.

The square root of 91880765 is about 9585.4454773891. The cubic root of 91880765 is about 451.2406340856.

The spelling of 91880765 in words is "ninety-one million, eight hundred eighty thousand, seven hundred sixty-five".