280400564 has 6 divisors (see below), whose sum is σ = 490700994. Its totient is φ = 140200280.

The previous prime is 280400557. The next prime is 280400597. The reversal of 280400564 is 465004082.

It can be written as a sum of positive squares in only one way, i.e., 267584164 + 12816400 = 16358^2 + 3580^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35050067 + ... + 35050074.

It is an arithmetic number, because the mean of its divisors is an integer number (81783499).

Almost surely, 2^280400564 is an apocalyptic number.

It is an amenable number.

280400564 is a deficient number, since it is larger than the sum of its proper divisors (210300430).

280400564 is a wasteful number, since it uses less digits than its factorization.

280400564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70100145 (or 70100143 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 29.

The square root of 280400564 is about 16745.1653918377. The cubic root of 280400564 is about 654.5250827718.

The spelling of 280400564 in words is "two hundred eighty million, four hundred thousand, five hundred sixty-four".