81139427058 has 64 divisors (see below), whose sum is σ = 175365907200. Its totient is φ = 24932524032.

The previous prime is 81139427053. The next prime is 81139427077. The reversal of 81139427058 is 85072493118.

It is a junction number, because it is equal to n+sod(n) for n = 81139426998 and 81139427016.

It is not an unprimeable number, because it can be changed into a prime (81139427053) 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, 3225666 + ... + 3250722.

It is an arithmetic number, because the mean of its divisors is an integer number (2740092300).

Almost surely, 2^81139427058 is an apocalyptic number.

81139427058 is an abundant number, since it is smaller than the sum of its proper divisors (94226480142).

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

81139427058 is a wasteful number, since it uses less digits than its factorization.

81139427058 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25731.

The product of its (nonzero) digits is 483840, while the sum is 48.

The spelling of 81139427058 in words is "eighty-one billion, one hundred thirty-nine million, four hundred twenty-seven thousand, fifty-eight".