91444860 has 72 divisors (see below), whose sum is σ = 298727520. Its totient is φ = 22508928.

The previous prime is 91444841. The next prime is 91444861. The reversal of 91444860 is 6844419.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91444861) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17200 + ... + 21879.

Almost surely, 2^91444860 is an apocalyptic number.

91444860 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

91444860 is an abundant number, since it is smaller than the sum of its proper divisors (207282660).

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

91444860 is a wasteful number, since it uses less digits than its factorization.

91444860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39107 (or 39102 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 91444860 is about 9562.6805865301. The cubic root of 91444860 is about 450.5259036687.

The spelling of 91444860 in words is "ninety-one million, four hundred forty-four thousand, eight hundred sixty".