81370730392 has 64 divisors (see below), whose sum is σ = 178920944640. Its totient is φ = 33969196800.

The previous prime is 81370730377. The next prime is 81370730407. The reversal of 81370730392 is 29303707318.

It is an interprime number because it is at equal distance from previous prime (81370730377) and next prime (81370730407).

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 482092 + ... + 628612.

It is an arithmetic number, because the mean of its divisors is an integer number (2795639760).

Almost surely, 2^81370730392 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81370730392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89460472320).

81370730392 is an abundant number, since it is smaller than the sum of its proper divisors (97550214248).

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

81370730392 is a wasteful number, since it uses less digits than its factorization.

81370730392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146792 (or 146788 counting only the distinct ones).

The product of its (nonzero) digits is 190512, while the sum is 43.

The spelling of 81370730392 in words is "eighty-one billion, three hundred seventy million, seven hundred thirty thousand, three hundred ninety-two".