28751821892 has 6 divisors (see below), whose sum is σ = 50315688318. Its totient is φ = 14375910944.

The previous prime is 28751821871. The next prime is 28751821939. The reversal of 28751821892 is 29812815782.

It can be written as a sum of positive squares in only one way, i.e., 28132011076 + 619810816 = 167726^2 + 24896^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3593977733 + ... + 3593977740.

It is an arithmetic number, because the mean of its divisors is an integer number (8385948053).

Almost surely, 2^28751821892 is an apocalyptic number.

It is an amenable number.

28751821892 is a deficient number, since it is larger than the sum of its proper divisors (21563866426).

28751821892 is a wasteful number, since it uses less digits than its factorization.

28751821892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7187955477 (or 7187955475 counting only the distinct ones).

The product of its digits is 1290240, while the sum is 53.

The spelling of 28751821892 in words is "twenty-eight billion, seven hundred fifty-one million, eight hundred twenty-one thousand, eight hundred ninety-two".