280487904 has 48 divisors (see below), whose sum is σ = 738097920. Its totient is φ = 93265280.

The previous prime is 280487903. The next prime is 280487953. The reversal of 280487904 is 409784082.

280487904 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (48).

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280487903) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37987 + ... + 44765.

It is an arithmetic number, because the mean of its divisors is an integer number (15377040).

Almost surely, 2^280487904 is an apocalyptic number.

280487904 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

280487904 is an abundant number, since it is smaller than the sum of its proper divisors (457610016).

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

280487904 is a wasteful number, since it uses less digits than its factorization.

280487904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7223 (or 7215 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 42.

The square root of 280487904 is about 16747.7731056998. The cubic root of 280487904 is about 654.5930335223.

The spelling of 280487904 in words is "two hundred eighty million, four hundred eighty-seven thousand, nine hundred four".