28739134128 has 30 divisors (see below), whose sum is σ = 74245797444. Its totient is φ = 9579319872.

The previous prime is 28739134121. The next prime is 28739134139. The reversal of 28739134128 is 82143193782.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (28739134121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1162278 + ... + 1186746.

Almost surely, 2^28739134128 is an apocalyptic number.

It is an amenable number.

28739134128 is an abundant number, since it is smaller than the sum of its proper divisors (45506663316).

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

28739134128 is an frugal number, since it uses more digits than its factorization.

28739134128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48949 (or 24474 counting only the distinct ones).

The product of its digits is 580608, while the sum is 48.

Multiplying 28739134128 by its sum of digits (48), we get a square (1379478438144 = 1174512²).

28739134128 divided by its sum of digits (48) gives a square (598731961 = 24469²).

The spelling of 28739134128 in words is "twenty-eight billion, seven hundred thirty-nine million, one hundred thirty-four thousand, one hundred twenty-eight".