28078280028 has 72 divisors (see below), whose sum is σ = 74790235520. Its totient is φ = 8857447200.

The previous prime is 28078280003. The next prime is 28078280033. The reversal of 28078280028 is 82008287082.

28078280028 is a `hidden beast` number, since 280 + 78 + 280 + 0 + 28 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 640203 + ... + 682653.

Almost surely, 2^28078280028 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 28078280028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37395117760).

28078280028 is an abundant number, since it is smaller than the sum of its proper divisors (46711955492).

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

28078280028 is a wasteful number, since it uses less digits than its factorization.

28078280028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43447 (or 43442 counting only the distinct ones).

The product of its (nonzero) digits is 229376, while the sum is 45.

The spelling of 28078280028 in words is "twenty-eight billion, seventy-eight million, two hundred eighty thousand, twenty-eight".