28044816639 has 32 divisors (see below), whose sum is σ = 44997818880. Its totient is φ = 15177549312.

The previous prime is 28044816623. The next prime is 28044816659. The reversal of 28044816639 is 93661844082.

It is not a de Polignac number, because 28044816639 - 2⁴ = 28044816623 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28044816591 and 28044816600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28044816659) 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, 1616499 + ... + 1633755.

It is an arithmetic number, because the mean of its divisors is an integer number (1406181840).

Almost surely, 2^28044816639 is an apocalyptic number.

28044816639 is a deficient number, since it is larger than the sum of its proper divisors (16953002241).

28044816639 is a wasteful number, since it uses less digits than its factorization.

28044816639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21359.

The product of its (nonzero) digits is 1990656, while the sum is 51.

The spelling of 28044816639 in words is "twenty-eight billion, forty-four million, eight hundred sixteen thousand, six hundred thirty-nine".