91913028480 has 512 divisors, whose sum is σ = 400653388800. Its totient is φ = 19392307200.

The previous prime is 91913028469. The next prime is 91913028521. The reversal of 91913028480 is 8482031919.

91913028480 is a `hidden beast` number, since 9 + 19 + 130 + 28 + 480 = 666.

It is a super-2 number, since 2×91913028480² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

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, 1543255 + ... + 1601705.

It is an arithmetic number, because the mean of its divisors is an integer number (782526150).

Almost surely, 2^91913028480 is an apocalyptic number.

91913028480 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 91913028480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (200326694400).

91913028480 is an abundant number, since it is smaller than the sum of its proper divisors (308740360320).

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

91913028480 is a wasteful number, since it uses less digits than its factorization.

91913028480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58499 (or 58481 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The spelling of 91913028480 in words is "ninety-one billion, nine hundred thirteen million, twenty-eight thousand, four hundred eighty".