91822720 has 64 divisors (see below), whose sum is σ = 239487840. Its totient is φ = 33387520.

The previous prime is 91822697. The next prime is 91822721. The reversal of 91822720 is 2722819.

It is a tau number, because it is divible by the number of its divisors (64).

It is not an unprimeable number, because it can be changed into a prime (91822721) by changing a digit.

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, 519 + ... + 13561.

Almost surely, 2^91822720 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91822720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (119743920).

91822720 is an abundant number, since it is smaller than the sum of its proper divisors (147665120).

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

91822720 is a wasteful number, since it uses less digits than its factorization.

91822720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13073 (or 13061 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 91822720 is about 9582.4172315758. The cubic root of 91822720 is about 451.1455914139.

The spelling of 91822720 in words is "ninety-one million, eight hundred twenty-two thousand, seven hundred twenty".