28439453128 has 8 divisors (see below), whose sum is σ = 53323974630. Its totient is φ = 14219726560.

The previous prime is 28439453117. The next prime is 28439453129. The reversal of 28439453128 is 82135493482.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 28089089604 + 350363524 = 167598^2 + 18718^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (28439453129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1777465813 + ... + 1777465828.

Almost surely, 2^28439453128 is an apocalyptic number.

It is an amenable number.

28439453128 is a deficient number, since it is larger than the sum of its proper divisors (24884521502).

28439453128 is a wasteful number, since it uses less digits than its factorization.

28439453128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3554931647 (or 3554931643 counting only the distinct ones).

The product of its digits is 1658880, while the sum is 49.

The spelling of 28439453128 in words is "twenty-eight billion, four hundred thirty-nine million, four hundred fifty-three thousand, one hundred twenty-eight".