91124015808 has 672 divisors, whose sum is σ = 316227317760. Its totient is φ = 22945628160.

The previous prime is 91124015803. The next prime is 91124015821. The reversal of 91124015808 is 80851042119.

It is a tau number, because it is divible by the number of its divisors (672).

It is not an unprimeable number, because it can be changed into a prime (91124015803) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 477088993 + ... + 477089183.

Almost surely, 2^91124015808 is an apocalyptic number.

91124015808 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 91124015808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (158113658880).

91124015808 is an abundant number, since it is smaller than the sum of its proper divisors (225103301952).

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

91124015808 is a wasteful number, since it uses less digits than its factorization.

91124015808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 413 (or 396 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 39.

The spelling of 91124015808 in words is "ninety-one billion, one hundred twenty-four million, fifteen thousand, eight hundred eight".