91270665 has 64 divisors (see below), whose sum is σ = 169850880. Its totient is φ = 46448640.

The previous prime is 91270651. The next prime is 91270667. The reversal of 91270665 is 56607219.

91270665 = T₂₆₂ + T₂₆₃ + ... + T₈₂₆.

It is not a de Polignac number, because 91270665 - 2⁴ = 91270649 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (91270667) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 472809 + ... + 473001.

It is an arithmetic number, because the mean of its divisors is an integer number (2653920).

Almost surely, 2^91270665 is an apocalyptic number.

It is an amenable number.

91270665 is a deficient number, since it is larger than the sum of its proper divisors (78580215).

91270665 is a wasteful number, since it uses less digits than its factorization.

91270665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351 (or 345 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

The square root of 91270665 is about 9553.5681815749. The cubic root of 91270665 is about 450.2396501280.

The spelling of 91270665 in words is "ninety-one million, two hundred seventy thousand, six hundred sixty-five".