91356720 has 320 divisors, whose sum is σ = 359976960. Its totient is φ = 18653184.

The previous prime is 91356719. The next prime is 91356739. The reversal of 91356720 is 2765319.

It is a super-3 number, since 3×91356720³ (a number of 25 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1026436 + ... + 1026524.

It is an arithmetic number, because the mean of its divisors is an integer number (1124928).

Almost surely, 2^91356720 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 91356720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (179988480).

91356720 is an abundant number, since it is smaller than the sum of its proper divisors (268620240).

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

91356720 is a wasteful number, since it uses less digits than its factorization.

91356720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172 (or 166 counting only the distinct ones).

The product of its (nonzero) digits is 11340, while the sum is 33.

The square root of 91356720 is about 9558.0709350789. The cubic root of 91356720 is about 450.3811092426.

The spelling of 91356720 in words is "ninety-one million, three hundred fifty-six thousand, seven hundred twenty".