91616765 has 16 divisors (see below), whose sum is σ = 116251200. Its totient is φ = 69121152.

The previous prime is 91616761. The next prime is 91616809. The reversal of 91616765 is 56761619.

91616765 = 190² + 191² + ... + 655².

It is a cyclic number.

It is not a de Polignac number, because 91616765 - 2² = 91616761 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91616761) 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, 20066 + ... + 24204.

It is an arithmetic number, because the mean of its divisors is an integer number (7265700).

Almost surely, 2^91616765 is an apocalyptic number.

91616765 is a gapful number since it is divisible by the number (95) formed by its first and last digit.

It is an amenable number.

91616765 is a deficient number, since it is larger than the sum of its proper divisors (24634435).

91616765 is a wasteful number, since it uses less digits than its factorization.

91616765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4396.

The product of its digits is 68040, while the sum is 41.

The square root of 91616765 is about 9571.6646932495. The cubic root of 91616765 is about 450.8080378985.

The spelling of 91616765 in words is "ninety-one million, six hundred sixteen thousand, seven hundred sixty-five".