91997706 has 32 divisors (see below), whose sum is σ = 189342720. Its totient is φ = 29784816.

The previous prime is 91997687. The next prime is 91997743. The reversal of 91997706 is 60779919.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38025 + ... + 40371.

It is an arithmetic number, because the mean of its divisors is an integer number (5916960).

Almost surely, 2^91997706 is an apocalyptic number.

91997706 is an abundant number, since it is smaller than the sum of its proper divisors (97345014).

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

91997706 is a wasteful number, since it uses less digits than its factorization.

91997706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2538.

The product of its (nonzero) digits is 214326, while the sum is 48.

The square root of 91997706 is about 9591.5434628635. The cubic root of 91997706 is about 451.4319913655.

The spelling of 91997706 in words is "ninety-one million, nine hundred ninety-seven thousand, seven hundred six".