91421760 has 56 divisors (see below), whose sum is σ = 290267136. Its totient is φ = 24378880.

The previous prime is 91421731. The next prime is 91421791. The reversal of 91421760 is 6712419.

It is a happy number.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

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, 46656 + ... + 48575.

Almost surely, 2^91421760 is an apocalyptic number.

It is an amenable number.

91421760 is an abundant number, since it is smaller than the sum of its proper divisors (198845376).

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

91421760 is a wasteful number, since it uses less digits than its factorization.

91421760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95251 (or 95241 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 91421760 is about 9561.4726899155. The cubic root of 91421760 is about 450.4879645040.

The spelling of 91421760 in words is "ninety-one million, four hundred twenty-one thousand, seven hundred sixty".