28078812288 has 72 divisors (see below), whose sum is σ = 80816076705. Its totient is φ = 9357708288.

The previous prime is 28078812253. The next prime is 28078812337. The reversal of 28078812288 is 88221887082.

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.

28078812288 is a `hidden beast` number, since 280 + 7 + 8 + 81 + 2 + 288 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 27958515264 + 120297024 = 167208^2 + 10968^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=118488.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 5684956 + ... + 5689892.

Almost surely, 2^28078812288 is an apocalyptic number.

It is an amenable number.

28078812288 is an abundant number, since it is smaller than the sum of its proper divisors (52737264417).

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

28078812288 is an frugal number, since it uses more digits than its factorization.

28078812288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9894 (or 4942 counting only the distinct ones).

The product of its (nonzero) digits is 1835008, while the sum is 54.

The spelling of 28078812288 in words is "twenty-eight billion, seventy-eight million, eight hundred twelve thousand, two hundred eighty-eight".