280628145 has 120 divisors (see below), whose sum is σ = 595900800. Its totient is φ = 125955648.

The previous prime is 280628077. The next prime is 280628147. The reversal of 280628145 is 541826082.

280628145 is a `hidden beast` number, since 28 + 0 + 628 + 1 + 4 + 5 = 666.

It is not a de Polignac number, because 280628145 - 2⁸ = 280627889 is a prime.

It is a super-2 number, since 2×280628145² = 157504311532282050, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (280628147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 1567666 + ... + 1567844.

It is an arithmetic number, because the mean of its divisors is an integer number (4965840).

Almost surely, 2^280628145 is an apocalyptic number.

It is an amenable number.

280628145 is an abundant number, since it is smaller than the sum of its proper divisors (315272655).

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

280628145 is a wasteful number, since it uses less digits than its factorization.

280628145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289 (or 273 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 36.

The square root of 280628145 is about 16751.9594376300. The cubic root of 280628145 is about 654.7021118875.

The spelling of 280628145 in words is "two hundred eighty million, six hundred twenty-eight thousand, one hundred forty-five".