91838731824 has 140 divisors (see below), whose sum is σ = 304896582096. Its totient is φ = 26239614336.

The previous prime is 91838731811. The next prime is 91838731861. The reversal of 91838731824 is 42813783819.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 480759 + ... + 644054.

Almost surely, 2^91838731824 is an apocalyptic number.

It is an amenable number.

91838731824 is an abundant number, since it is smaller than the sum of its proper divisors (213057850272).

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

91838731824 is a wasteful number, since it uses less digits than its factorization.

91838731824 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1124846 (or 1124825 counting only the distinct ones).

The product of its digits is 2322432, while the sum is 54.

The spelling of 91838731824 in words is "ninety-one billion, eight hundred thirty-eight million, seven hundred thirty-one thousand, eight hundred twenty-four".