280972872 has 48 divisors (see below), whose sum is σ = 805734540. Its totient is φ = 88147968.

The previous prime is 280972849. The next prime is 280972873. The reversal of 280972872 is 278279082.

It is a happy number.

280972872 is a `hidden beast` number, since 280 + 97 + 287 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 274034916 + 6937956 = 16554^2 + 2634^2 .

It is not an unprimeable number, because it can be changed into a prime (280972873) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 113553 + ... + 116000.

Almost surely, 2^280972872 is an apocalyptic number.

It is an amenable number.

280972872 is an abundant number, since it is smaller than the sum of its proper divisors (524761668).

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

280972872 is a wasteful number, since it uses less digits than its factorization.

280972872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229582 (or 229575 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 45.

The square root of 280972872 is about 16762.2454343086. The cubic root of 280972872 is about 654.9700835160.

The spelling of 280972872 in words is "two hundred eighty million, nine hundred seventy-two thousand, eight hundred seventy-two".