261710280 has 96 divisors (see below), whose sum is σ = 916002360. Its totient is φ = 64419840.

The previous prime is 261710279. The next prime is 261710299. The reversal of 261710280 is 82017162.

261710280 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 234273636 + 27436644 = 15306^2 + 5238^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23281 + ... + 32640.

Almost surely, 2^261710280 is an apocalyptic number.

261710280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261710280 is an abundant number, since it is smaller than the sum of its proper divisors (654292080).

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

261710280 is a wasteful number, since it uses less digits than its factorization.

261710280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55951 (or 55944 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 261710280 is about 16177.4621000947. The cubic root of 261710280 is about 639.6468429214.

The spelling of 261710280 in words is "two hundred sixty-one million, seven hundred ten thousand, two hundred eighty".