91377720 has 384 divisors, whose sum is σ = 377395200. Its totient is φ = 19408896.

The previous prime is 91377691. The next prime is 91377733. The reversal of 91377720 is 2777319.

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

It is a congruent number.

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 95 ways as a sum of consecutive naturals, for example, 1156641 + ... + 1156719.

It is an arithmetic number, because the mean of its divisors is an integer number (982800).

Almost surely, 2^91377720 is an apocalyptic number.

91377720 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91377720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (188697600).

91377720 is an abundant number, since it is smaller than the sum of its proper divisors (286017480).

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

91377720 is a wasteful number, since it uses less digits than its factorization.

91377720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129 (or 113 counting only the distinct ones).

The product of its (nonzero) digits is 18522, while the sum is 36.

The square root of 91377720 is about 9559.1694199862. The cubic root of 91377720 is about 450.4156160225.

The spelling of 91377720 in words is "ninety-one million, three hundred seventy-seven thousand, seven hundred twenty".