91454720 has 144 divisors (see below), whose sum is σ = 256072320. Its totient is φ = 30646272.

The previous prime is 91454707. The next prime is 91454729. The reversal of 91454720 is 2745419.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91454729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 528554 + ... + 528726.

It is an arithmetic number, because the mean of its divisors is an integer number (1778280).

Almost surely, 2^91454720 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 91454720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (128036160).

91454720 is an abundant number, since it is smaller than the sum of its proper divisors (164617600).

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

91454720 is a wasteful number, since it uses less digits than its factorization.

91454720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260 (or 246 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 91454720 is about 9563.1961184533. The cubic root of 91454720 is about 450.5420956696.

The spelling of 91454720 in words is "ninety-one million, four hundred fifty-four thousand, seven hundred twenty".