81228598704 has 60 divisors (see below), whose sum is σ = 247993378152. Its totient is φ = 24614726400.

The previous prime is 81228598681. The next prime is 81228598729. The reversal of 81228598704 is 40789582218.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25638757 + ... + 25641924.

Almost surely, 2^81228598704 is an apocalyptic number.

It is an amenable number.

81228598704 is an abundant number, since it is smaller than the sum of its proper divisors (166764779448).

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

81228598704 is a wasteful number, since it uses less digits than its factorization.

81228598704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51280706 (or 51280697 counting only the distinct ones).

The product of its (nonzero) digits is 2580480, while the sum is 54.

The spelling of 81228598704 in words is "eighty-one billion, two hundred twenty-eight million, five hundred ninety-eight thousand, seven hundred four".