81110923784 has 32 divisors (see below), whose sum is σ = 167022216000. Its totient is φ = 36621155520.

The previous prime is 81110923781. The next prime is 81110923793. The reversal of 81110923784 is 48732901118.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is not an unprimeable number, because it can be changed into a prime (81110923781) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3079892 + ... + 3106115.

It is an arithmetic number, because the mean of its divisors is an integer number (5219444250).

Almost surely, 2^81110923784 is an apocalyptic number.

It is an amenable number.

81110923784 is an abundant number, since it is smaller than the sum of its proper divisors (85911292216).

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

81110923784 is a wasteful number, since it uses less digits than its factorization.

81110923784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6186173 (or 6186169 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 44.

The spelling of 81110923784 in words is "eighty-one billion, one hundred ten million, nine hundred twenty-three thousand, seven hundred eighty-four".