91393660 has 12 divisors (see below), whose sum is σ = 191926728. Its totient is φ = 36557456.

The previous prime is 91393639. The next prime is 91393661. The reversal of 91393660 is 6639319.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91393661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2284822 + ... + 2284861.

It is an arithmetic number, because the mean of its divisors is an integer number (15993894).

Almost surely, 2^91393660 is an apocalyptic number.

It is an amenable number.

91393660 is an abundant number, since it is smaller than the sum of its proper divisors (100533068).

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

91393660 is a wasteful number, since it uses less digits than its factorization.

91393660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4569692 (or 4569690 counting only the distinct ones).

The product of its (nonzero) digits is 26244, while the sum is 37.

The square root of 91393660 is about 9560.0031380748. The cubic root of 91393660 is about 450.4418047824.

The spelling of 91393660 in words is "ninety-one million, three hundred ninety-three thousand, six hundred sixty".