28581005764 has 6 divisors (see below), whose sum is σ = 50016760094. Its totient is φ = 14290502880.

The previous prime is 28581005753. The next prime is 28581005773. The reversal of 28581005764 is 46750018582.

It can be written as a sum of positive squares in only one way, i.e., 28159524864 + 421480900 = 167808^2 + 20530^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3572625717 + ... + 3572625724.

Almost surely, 2^28581005764 is an apocalyptic number.

It is an amenable number.

28581005764 is a deficient number, since it is larger than the sum of its proper divisors (21435754330).

28581005764 is a wasteful number, since it uses less digits than its factorization.

28581005764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7145251445 (or 7145251443 counting only the distinct ones).

The product of its (nonzero) digits is 537600, while the sum is 46.

The spelling of 28581005764 in words is "twenty-eight billion, five hundred eighty-one million, five thousand, seven hundred sixty-four".