28512438807616 has 21 divisors (see below), whose sum is σ = 56579455526791. Its totient is φ = 14256198044992.

The previous prime is 28512438807599. The next prime is 28512438807623. The reversal of 28512438807616 is 61670883421582.

The square root of 28512438807616 is 5339704.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 42383901 + ... + 43051363.

Almost surely, 2^{28512438807616} is an apocalyptic number.

28512438807616 is the 5339704-th square number.

It is an amenable number.

28512438807616 is a deficient number, since it is larger than the sum of its proper divisors (28067016719175).

28512438807616 is an frugal number, since it uses more digits than its factorization.

28512438807616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1334938 (or 667465 counting only the distinct ones).

The product of its (nonzero) digits is 30965760, while the sum is 61.

The spelling of 28512438807616 in words is "twenty-eight trillion, five hundred twelve billion, four hundred thirty-eight million, eight hundred seven thousand, six hundred sixteen".