91899852408 has 576 divisors, whose sum is σ = 325361836800. Its totient is φ = 23201095680.

The previous prime is 91899852397. The next prime is 91899852413. The reversal of 91899852408 is 80425899819.

91899852408 is a `hidden beast` number, since 9 + 18 + 9 + 98 + 524 + 0 + 8 = 666.

It is a super-2 number, since 2×91899852408² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 154974160 + ... + 154974752.

It is an arithmetic number, because the mean of its divisors is an integer number (564864300).

Almost surely, 2^91899852408 is an apocalyptic number.

91899852408 is a gapful number since it is divisible by the number (98) 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 91899852408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (162680918400).

91899852408 is an abundant number, since it is smaller than the sum of its proper divisors (233461984392).

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

91899852408 is a wasteful number, since it uses less digits than its factorization.

91899852408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 772 (or 758 counting only the distinct ones).

The product of its (nonzero) digits is 14929920, while the sum is 63.

The spelling of 91899852408 in words is "ninety-one billion, eight hundred ninety-nine million, eight hundred fifty-two thousand, four hundred eight".