91072660 has 24 divisors (see below), whose sum is σ = 218574720. Its totient is φ = 31224864.

The previous prime is 91072649. The next prime is 91072679. The reversal of 91072660 is 6627019.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 325120 + ... + 325399.

It is an arithmetic number, because the mean of its divisors is an integer number (9107280).

Almost surely, 2^91072660 is an apocalyptic number.

It is an amenable number.

91072660 is an abundant number, since it is smaller than the sum of its proper divisors (127502060).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91072660 is a wasteful number, since it uses less digits than its factorization.

91072660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 650535 (or 650533 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 91072660 is about 9543.1996730656. The cubic root of 91072660 is about 449.9138271208.

Adding to 91072660 its reverse (6627019), we get a palindrome (97699679).

The spelling of 91072660 in words is "ninety-one million, seventy-two thousand, six hundred sixty".