280906045 has 16 divisors (see below), whose sum is σ = 407904768. Its totient is φ = 181290240.

The previous prime is 280906039. The next prime is 280906069. The reversal of 280906045 is 540609082.

It is a happy number.

It is not a de Polignac number, because 280906045 - 2¹⁵ = 280873277 is a prime.

It is a super-2 number, since 2×280906045² = 157816412235084050, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 280906045.

It is a congruent number.

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, 235461 + ... + 236650.

It is an arithmetic number, because the mean of its divisors is an integer number (25494048).

Almost surely, 2^280906045 is an apocalyptic number.

It is an amenable number.

280906045 is a deficient number, since it is larger than the sum of its proper divisors (126998723).

280906045 is a wasteful number, since it uses less digits than its factorization.

280906045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 472140.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 280906045 is about 16760.2519372472. The cubic root of 280906045 is about 654.9181530503.

The spelling of 280906045 in words is "two hundred eighty million, nine hundred six thousand, forty-five".