28531288172 has 24 divisors (see below), whose sum is σ = 50649310656. Its totient is φ = 14060331648.

The previous prime is 28531288153. The next prime is 28531288199. The reversal of 28531288172 is 27188213582.

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, 390653 + ... + 457899.

It is an arithmetic number, because the mean of its divisors is an integer number (2110387944).

Almost surely, 2^28531288172 is an apocalyptic number.

It is an amenable number.

28531288172 is a deficient number, since it is larger than the sum of its proper divisors (22118022484).

28531288172 is a wasteful number, since it uses less digits than its factorization.

28531288172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68777 (or 68775 counting only the distinct ones).

The product of its digits is 430080, while the sum is 47.

The spelling of 28531288172 in words is "twenty-eight billion, five hundred thirty-one million, two hundred eighty-eight thousand, one hundred seventy-two".