91899672 has 32 divisors (see below), whose sum is σ = 233519280. Its totient is φ = 30130560.

The previous prime is 91899659. The next prime is 91899677. The reversal of 91899672 is 27699819.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91899677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29923 + ... + 32850.

Almost surely, 2^91899672 is an apocalyptic number.

It is an amenable number.

91899672 is an abundant number, since it is smaller than the sum of its proper divisors (141619608).

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

91899672 is a wasteful number, since it uses less digits than its factorization.

91899672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62843 (or 62839 counting only the distinct ones).

The product of its digits is 489888, while the sum is 51.

The square root of 91899672 is about 9586.4316614682. The cubic root of 91899672 is about 451.2715836956.

The spelling of 91899672 in words is "ninety-one million, eight hundred ninety-nine thousand, six hundred seventy-two".