91938182820 has 96 divisors (see below), whose sum is σ = 280878022656. Its totient is φ = 22284182400.

The previous prime is 91938182747. The next prime is 91938182821. The reversal of 91938182820 is 2828183919.

It is not an unprimeable number, because it can be changed into a prime (91938182821) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6293725 + ... + 6308315.

It is an arithmetic number, because the mean of its divisors is an integer number (2925812736).

Almost surely, 2^91938182820 is an apocalyptic number.

It is an amenable number.

91938182820 is an abundant number, since it is smaller than the sum of its proper divisors (188939839836).

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

91938182820 is a wasteful number, since it uses less digits than its factorization.

91938182820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24161 (or 24159 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 51.

The spelling of 91938182820 in words is "ninety-one billion, nine hundred thirty-eight million, one hundred eighty-two thousand, eight hundred twenty".