91139660 has 24 divisors (see below), whose sum is σ = 194639760. Its totient is φ = 35837504.

The previous prime is 91139641. The next prime is 91139677. The reversal of 91139660 is 6693119.

It is a self number, because there is not a number n which added to its sum of digits gives 91139660.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37439 + ... + 39798.

It is an arithmetic number, because the mean of its divisors is an integer number (8109990).

Almost surely, 2^91139660 is an apocalyptic number.

It is an amenable number.

91139660 is an abundant number, since it is smaller than the sum of its proper divisors (103500100).

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

91139660 is a wasteful number, since it uses less digits than its factorization.

91139660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77305 (or 77303 counting only the distinct ones).

The product of its (nonzero) digits is 8748, while the sum is 35.

The square root of 91139660 is about 9546.7093807238. The cubic root of 91139660 is about 450.0241303933.

The spelling of 91139660 in words is "ninety-one million, one hundred thirty-nine thousand, six hundred sixty".