91422720 has 204 divisors, whose sum is σ = 327153216. Its totient is φ = 23592960.

The previous prime is 91422707. The next prime is 91422767. The reversal of 91422720 is 2722419.

It is a super-2 number, since 2×91422720² = 16716227464396800, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2949105 + ... + 2949135.

Almost surely, 2^91422720 is an apocalyptic number.

91422720 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 91422720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (163576608).

91422720 is an abundant number, since it is smaller than the sum of its proper divisors (235730496).

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

91422720 is an equidigital number, since it uses as much as digits as its factorization.

91422720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74 (or 41 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 91422720 is about 9561.5228912553. The cubic root of 91422720 is about 450.4895413238.

The spelling of 91422720 in words is "ninety-one million, four hundred twenty-two thousand, seven hundred twenty".