261770260 has 24 divisors (see below), whose sum is σ = 561415680. Its totient is φ = 102479904.

The previous prime is 261770219. The next prime is 261770309. The reversal of 261770260 is 62077162.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 138300 + ... + 140179.

It is an arithmetic number, because the mean of its divisors is an integer number (23392320).

Almost surely, 2^261770260 is an apocalyptic number.

261770260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261770260 is an abundant number, since it is smaller than the sum of its proper divisors (299645420).

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

261770260 is a wasteful number, since it uses less digits than its factorization.

261770260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278535 (or 278533 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 261770260 is about 16179.3158075365. The cubic root of 261770260 is about 639.6957049519.

The spelling of 261770260 in words is "two hundred sixty-one million, seven hundred seventy thousand, two hundred sixty".