81354728442 has 32 divisors (see below), whose sum is σ = 175237276032. Its totient is φ = 25030551744.

The previous prime is 81354728417. The next prime is 81354728459. The reversal of 81354728442 is 24482745318.

It is a junction number, because it is equal to n+sod(n) for n = 81354728391 and 81354728400.

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, 1673868 + ... + 1721784.

It is an arithmetic number, because the mean of its divisors is an integer number (5476164876).

Almost surely, 2^81354728442 is an apocalyptic number.

81354728442 is an abundant number, since it is smaller than the sum of its proper divisors (93882547590).

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

81354728442 is a wasteful number, since it uses less digits than its factorization.

81354728442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69702.

The product of its digits is 1720320, while the sum is 48.

The spelling of 81354728442 in words is "eighty-one billion, three hundred fifty-four million, seven hundred twenty-eight thousand, four hundred forty-two".