91998860 has 48 divisors (see below), whose sum is σ = 197328096. Its totient is φ = 36022272.

The previous prime is 91998859. The next prime is 91998869. The reversal of 91998860 is 6889919.

It is a junction number, because it is equal to n+sod(n) for n = 91998799 and 91998808.

It is not an unprimeable number, because it can be changed into a prime (91998869) 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, 260444 + ... + 260796.

It is an arithmetic number, because the mean of its divisors is an integer number (4111002).

Almost surely, 2^91998860 is an apocalyptic number.

It is an amenable number.

91998860 is an abundant number, since it is smaller than the sum of its proper divisors (105329236).

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

91998860 is a wasteful number, since it uses less digits than its factorization.

91998860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 602 (or 600 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 50.

The square root of 91998860 is about 9591.6036198333. The cubic root of 91998860 is about 451.4338789138.

The spelling of 91998860 in words is "ninety-one million, nine hundred ninety-eight thousand, eight hundred sixty".