28856457644 has 24 divisors (see below), whose sum is σ = 57717031680. Its totient is φ = 12366171216.

The previous prime is 28856457563. The next prime is 28856457653. The reversal of 28856457644 is 44675465882.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 500729 + ... + 555375.

It is an arithmetic number, because the mean of its divisors is an integer number (2404876320).

Almost surely, 2^28856457644 is an apocalyptic number.

It is an amenable number.

28856457644 is an abundant number, since it is smaller than the sum of its proper divisors (28860574036).

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

28856457644 is a wasteful number, since it uses less digits than its factorization.

28856457644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73517 (or 73515 counting only the distinct ones).

The product of its digits is 51609600, while the sum is 59.

The spelling of 28856457644 in words is "twenty-eight billion, eight hundred fifty-six million, four hundred fifty-seven thousand, six hundred forty-four".