280616945 has 16 divisors (see below), whose sum is σ = 385806720. Its totient is φ = 191942784.

The previous prime is 280616939. The next prime is 280616989. The reversal of 280616945 is 549616082.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 280616945 - 2¹⁶ = 280551409 is a prime.

It is a super-2 number, since 2×280616945² = 157491739642266050, which contains 22 as substring.

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, 4514 + ... + 24116.

It is an arithmetic number, because the mean of its divisors is an integer number (24112920).

Almost surely, 2^280616945 is an apocalyptic number.

It is an amenable number.

280616945 is a deficient number, since it is larger than the sum of its proper divisors (105189775).

280616945 is a wasteful number, since it uses less digits than its factorization.

280616945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20024.

The product of its (nonzero) digits is 103680, while the sum is 41.

The square root of 280616945 is about 16751.6251450419. The cubic root of 280616945 is about 654.6934019495.

The spelling of 280616945 in words is "two hundred eighty million, six hundred sixteen thousand, nine hundred forty-five".