280840630 has 24 divisors (see below), whose sum is σ = 578017872. Its totient is φ = 96240144.

The previous prime is 280840627. The next prime is 280840699. The reversal of 280840630 is 36048082.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 280840592 and 280840601.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 139209 + ... + 141211.

It is an arithmetic number, because the mean of its divisors is an integer number (24084078).

Almost surely, 2^280840630 is an apocalyptic number.

280840630 is an abundant number, since it is smaller than the sum of its proper divisors (297177242).

280840630 is an frugal number, since it uses more digits than its factorization.

280840630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4020 (or 2017 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 280840630 is about 16758.3003314775. The cubic root of 280840630 is about 654.8673118554.

The spelling of 280840630 in words is "two hundred eighty million, eight hundred forty thousand, six hundred thirty".