28722771842 has 6 divisors (see below), whose sum is σ = 43084517283. Its totient is φ = 14361266082.

The previous prime is 28722771761. The next prime is 28722771907. The reversal of 28722771842 is 24817722782.

It can be written as a sum of positive squares in only one way, i.e., 14361385921 + 14361385921 = 119839^2 + 119839^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=119839.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 179759 + ... + 299597.

Almost surely, 2^28722771842 is an apocalyptic number.

28722771842 is a deficient number, since it is larger than the sum of its proper divisors (14361745441).

28722771842 is an frugal number, since it uses more digits than its factorization.

28722771842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239680 (or 119841 counting only the distinct ones).

The product of its digits is 1404928, while the sum is 50.

Multiplying 28722771842 by its sum of digits (50), we get a square (1436138592100 = 1198390²).

The spelling of 28722771842 in words is "twenty-eight billion, seven hundred twenty-two million, seven hundred seventy-one thousand, eight hundred forty-two".