280971252 has 18 divisors (see below), whose sum is σ = 710232978. Its totient is φ = 93657072.

The previous prime is 280971247. The next prime is 280971253. The reversal of 280971252 is 252179082.

It can be written as a sum of positive squares in only one way, i.e., 257409936 + 23561316 = 16044^2 + 4854^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 7804757 = 280971252 / (2 + 8 + 0 + 9 + 7 + 1 + 2 + 5 + 2).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280971253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3902343 + ... + 3902414.

Almost surely, 2^280971252 is an apocalyptic number.

It is an amenable number.

280971252 is an abundant number, since it is smaller than the sum of its proper divisors (429261726).

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

280971252 is a wasteful number, since it uses less digits than its factorization.

280971252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7804767 (or 7804762 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 280971252 is about 16762.1971113574. The cubic root of 280971252 is about 654.9688247307.

The spelling of 280971252 in words is "two hundred eighty million, nine hundred seventy-one thousand, two hundred fifty-two".