91441920 has 72 divisors (see below), whose sum is σ = 292054896. Its totient is φ = 24383488.

The previous prime is 91441919. The next prime is 91441937. The reversal of 91441920 is 2914419.

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 (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8067 + ... + 15746.

It is an arithmetic number, because the mean of its divisors is an integer number (4056318).

Almost surely, 2^91441920 is an apocalyptic number.

It is an amenable number.

91441920 is an abundant number, since it is smaller than the sum of its proper divisors (200612976).

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

91441920 is a wasteful number, since it uses less digits than its factorization.

91441920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23837 (or 23823 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 91441920 is about 9562.5268627074. The cubic root of 91441920 is about 450.5210754026.

The spelling of 91441920 in words is "ninety-one million, four hundred forty-one thousand, nine hundred twenty".