91766385 has 16 divisors (see below), whose sum is σ = 163140480. Its totient is φ = 48942000.

The previous prime is 91766383. The next prime is 91766393. The reversal of 91766385 is 58366719.

It is a happy number.

91766385 is a `hidden beast` number, since 9 + 1 + 7 + 6 + 638 + 5 = 666.

It is not a de Polignac number, because 91766385 - 2¹ = 91766383 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 91766385.

It is not an unprimeable number, because it can be changed into a prime (91766383) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 339741 + ... + 340010.

It is an arithmetic number, because the mean of its divisors is an integer number (10196280).

Almost surely, 2^91766385 is an apocalyptic number.

It is an amenable number.

91766385 is a deficient number, since it is larger than the sum of its proper divisors (71374095).

91766385 is a wasteful number, since it uses less digits than its factorization.

91766385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 679765 (or 679759 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

The square root of 91766385 is about 9579.4772821903. The cubic root of 91766385 is about 451.0533103813.

The spelling of 91766385 in words is "ninety-one million, seven hundred sixty-six thousand, three hundred eighty-five".