91908970 has 32 divisors (see below), whose sum is σ = 178910208. Its totient is φ = 33861888.

The previous prime is 91908967. The next prime is 91908977. The reversal of 91908970 is 7980919.

It is not an unprimeable number, because it can be changed into a prime (91908977) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2239 + ... + 13741.

It is an arithmetic number, because the mean of its divisors is an integer number (5590944).

Almost surely, 2^91908970 is an apocalyptic number.

91908970 is a deficient number, since it is larger than the sum of its proper divisors (87001238).

91908970 is a wasteful number, since it uses less digits than its factorization.

91908970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11574.

The product of its (nonzero) digits is 40824, while the sum is 43.

The square root of 91908970 is about 9586.9166054577. The cubic root of 91908970 is about 451.2868023995.

The spelling of 91908970 in words is "ninety-one million, nine hundred eight thousand, nine hundred seventy".