280000000028 has 48 divisors (see below), whose sum is σ = 565724499648. Its totient is φ = 118774080000.

The previous prime is 279999999997. The next prime is 280000000031. The reversal of 280000000028 is 820000000082.

280000000028 = 199997² + 199998² + ... + 200003².

It is a junction number, because it is equal to n+sod(n) for n = 279999999937 and 280000000009.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9999968 + ... + 10027928.

It is an arithmetic number, because the mean of its divisors is an integer number (11785927076).

Almost surely, 2^280000000028 is an apocalyptic number.

280000000028 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

280000000028 is an abundant number, since it is smaller than the sum of its proper divisors (285724499620).

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

280000000028 is a wasteful number, since it uses less digits than its factorization.

280000000028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31614 (or 31612 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

It can be divided in two parts, 2800000000 and 28, that multiplied together give a square (78400000000 = 280000²).

The spelling of 280000000028 in words is "two hundred eighty billion, twenty-eight", and thus it is an aban number.