280400280 has 64 divisors (see below), whose sum is σ = 843091200. Its totient is φ = 74605440.

The previous prime is 280400279. The next prime is 280400327. The reversal of 280400280 is 82004082.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 280400280.

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, 56541 + ... + 61299.

It is an arithmetic number, because the mean of its divisors is an integer number (13173300).

Almost surely, 2^280400280 is an apocalyptic number.

280400280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

280400280 is an abundant number, since it is smaller than the sum of its proper divisors (562690920).

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

280400280 is a wasteful number, since it uses less digits than its factorization.

280400280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5264 (or 5260 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 24.

The square root of 280400280 is about 16745.1569117760. The cubic root of 280400280 is about 654.5248617960.

It can be divided in two parts, 2804002 and 80, that added together give a palindrome (2804082).

The spelling of 280400280 in words is "two hundred eighty million, four hundred thousand, two hundred eighty".