91749868 has 12 divisors (see below), whose sum is σ = 183499792. Its totient is φ = 39321360.

The previous prime is 91749857. The next prime is 91749883. The reversal of 91749868 is 86894719.

It is a happy number.

91749868 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1638363 + ... + 1638418.

Almost surely, 2^91749868 is an apocalyptic number.

It is an amenable number.

91749868 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

91749868 is a wasteful number, since it uses less digits than its factorization.

91749868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3276792 (or 3276790 counting only the distinct ones).

The product of its digits is 870912, while the sum is 52.

The square root of 91749868 is about 9578.6151399876. The cubic root of 91749868 is about 451.0262471143.

The spelling of 91749868 in words is "ninety-one million, seven hundred forty-nine thousand, eight hundred sixty-eight".