280997860 has 48 divisors (see below), whose sum is σ = 693266112. Its totient is φ = 94320000.

The previous prime is 280997839. The next prime is 280997881. The reversal of 280997860 is 68799082.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (280997839) and next prime (280997881).

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, 46266 + ... + 51985.

It is an arithmetic number, because the mean of its divisors is an integer number (14443044).

Almost surely, 2^280997860 is an apocalyptic number.

280997860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

280997860 is an abundant number, since it is smaller than the sum of its proper divisors (412268252).

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

280997860 is a wasteful number, since it uses less digits than its factorization.

280997860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98284 (or 98282 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 49.

The square root of 280997860 is about 16762.9907832702. The cubic root of 280997860 is about 654.9894992781.

The spelling of 280997860 in words is "two hundred eighty million, nine hundred ninety-seven thousand, eight hundred sixty".