280408887 has 48 divisors (see below), whose sum is σ = 457292160. Its totient is φ = 164116800.

The previous prime is 280408879. The next prime is 280408889. The reversal of 280408887 is 788804082.

It is not a de Polignac number, because 280408887 - 2³ = 280408879 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280408889) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 355908 + ... + 356694.

It is an arithmetic number, because the mean of its divisors is an integer number (9526920).

Almost surely, 2^280408887 is an apocalyptic number.

280408887 is a deficient number, since it is larger than the sum of its proper divisors (176883273).

280408887 is a wasteful number, since it uses less digits than its factorization.

280408887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 924 (or 921 counting only the distinct ones).

The product of its (nonzero) digits is 229376, while the sum is 45.

The square root of 280408887 is about 16745.4139094858. The cubic root of 280408887 is about 654.5315586959.

The spelling of 280408887 in words is "two hundred eighty million, four hundred eight thousand, eight hundred eighty-seven".