280260261 has 6 divisors (see below), whose sum is σ = 404820390. Its totient is φ = 186840168.

The previous prime is 280260251. The next prime is 280260269. The reversal of 280260261 is 162062082.

It can be written as a sum of positive squares in only one way, i.e., 272052036 + 8208225 = 16494^2 + 2865^2 .

It is not a de Polignac number, because 280260261 - 2¹⁰ = 280259237 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280260269) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 15570006 + ... + 15570023.

It is an arithmetic number, because the mean of its divisors is an integer number (67470065).

Almost surely, 2^280260261 is an apocalyptic number.

It is an amenable number.

280260261 is a deficient number, since it is larger than the sum of its proper divisors (124560129).

280260261 is a wasteful number, since it uses less digits than its factorization.

280260261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31140035 (or 31140032 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 280260261 is about 16740.9755092109. The cubic root of 280260261 is about 654.4158971218.

The spelling of 280260261 in words is "two hundred eighty million, two hundred sixty thousand, two hundred sixty-one".