81740319948 has 72 divisors (see below), whose sum is σ = 237941383680. Its totient is φ = 23176090080.

The previous prime is 81740319943. The next prime is 81740319949. The reversal of 81740319948 is 84991304718.

81740319948 is a `hidden beast` number, since 8 + 1 + 7 + 403 + 199 + 48 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 81740319894 and 81740319903.

It is not an unprimeable number, because it can be changed into a prime (81740319943) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1205028 + ... + 1271051.

It is an arithmetic number, because the mean of its divisors is an integer number (3304741440).

Almost surely, 2^81740319948 is an apocalyptic number.

It is an amenable number.

81740319948 is an abundant number, since it is smaller than the sum of its proper divisors (156201063732).

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

81740319948 is a wasteful number, since it uses less digits than its factorization.

81740319948 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2476227 (or 2476222 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 54.

The spelling of 81740319948 in words is "eighty-one billion, seven hundred forty million, three hundred nineteen thousand, nine hundred forty-eight".