280028020028 has 36 divisors (see below), whose sum is σ = 502623842280. Its totient is φ = 136509060480.

The previous prime is 280028020001. The next prime is 280028020031. The reversal of 280028020028 is 820020820082.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 280028019976 and 280028020003.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10832903 + ... + 10858721.

Almost surely, 2^280028020028 is an apocalyptic number.

It is an amenable number.

280028020028 is a deficient number, since it is larger than the sum of its proper divisors (222595822252).

280028020028 is a wasteful number, since it uses less digits than its factorization.

280028020028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27518 (or 27475 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 32.

The spelling of 280028020028 in words is "two hundred eighty billion, twenty-eight million, twenty thousand, twenty-eight".