91768957 has 16 divisors (see below), whose sum is σ = 108605952. Its totient is φ = 75911040.

The previous prime is 91768933. The next prime is 91768967. The reversal of 91768957 is 75986719.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91768957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91768927) 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, 22107 + ... + 25927.

It is an arithmetic number, because the mean of its divisors is an integer number (6787872).

Almost surely, 2^91768957 is an apocalyptic number.

It is an amenable number.

91768957 is a deficient number, since it is larger than the sum of its proper divisors (16836995).

91768957 is a wasteful number, since it uses less digits than its factorization.

91768957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3948.

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

The square root of 91768957 is about 9579.6115265704. The cubic root of 91768957 is about 451.0575243364.

The spelling of 91768957 in words is "ninety-one million, seven hundred sixty-eight thousand, nine hundred fifty-seven".