280328049 has 9 divisors (see below), whose sum is σ = 404990859. Its totient is φ = 186851880.

The previous prime is 280327991. The next prime is 280328131. The reversal of 280328049 is 940823082.

The square root of 280328049 is 16743.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 88228449 + 192099600 = 9393^2 + 13860^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 280328049 - 2⁷ = 280327921 is a prime.

It is a super-2 number, since 2×280328049² = 157167630112292802, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (280328149) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 47439 + ... + 53019.

Almost surely, 2^280328049 is an apocalyptic number.

280328049 is the 16743-rd square number.

280328049 is the 8372-nd centered octagonal number.

It is an amenable number.

280328049 is a deficient number, since it is larger than the sum of its proper divisors (124662810).

280328049 is an frugal number, since it uses more digits than its factorization.

280328049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11168 (or 5584 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The cubic root of 280328049 is about 654.4686551886.

Multiplying 280328049 by its sum of digits (36), we get a square (10091809764 = 100458²).

It can be divided in two parts, 280 and 328049, that added together give a square (328329 = 573²).

The spelling of 280328049 in words is "two hundred eighty million, three hundred twenty-eight thousand, forty-nine".