28892233728 has 144 divisors (see below), whose sum is σ = 83732693265. Its totient is φ = 9599975424.

The previous prime is 28892233717. The next prime is 28892233753. The reversal of 28892233728 is 82733229882.

It is a happy number.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

28892233728 is a `hidden beast` number, since 288 + 9 + 2 + 2 + 337 + 28 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 16746430464 + 12145803264 = 129408^2 + 110208^2 .

It is a tau number, because it is divible by the number of its divisors (144).

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=120192.

It is a super-2 number, since 2×28892233728² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 92307300 + ... + 92307612.

Almost surely, 2^28892233728 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28892233728

28892233728 is an abundant number, since it is smaller than the sum of its proper divisors (54840459537).

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

28892233728 is an frugal number, since it uses more digits than its factorization.

28892233728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 662 (or 318 counting only the distinct ones).

The product of its digits is 4644864, while the sum is 54.

The spelling of 28892233728 in words is "twenty-eight billion, eight hundred ninety-two million, two hundred thirty-three thousand, seven hundred twenty-eight".