261770 has 8 divisors (see below), whose sum is σ = 471204. Its totient is φ = 104704.

The previous prime is 261761. The next prime is 261773. The reversal of 261770 is 77162.

It is a happy number.

261770 is digitally balanced in base 3, 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 2 ways, for example, as 249001 + 12769 = 499^2 + 113^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 261770.

It is not an unprimeable number, because it can be changed into a prime (261773) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13079 + ... + 13098.

2²⁶¹⁷⁷⁰ is an apocalyptic number.

261770 is a deficient number, since it is larger than the sum of its proper divisors (209434).

261770 is a wasteful number, since it uses less digits than its factorization.

261770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26184.

The product of its (nonzero) digits is 588, while the sum is 23.

The square root of 261770 is about 511.6346352623. The cubic root of 261770 is about 63.9695493162.

The spelling of 261770 in words is "two hundred sixty-one thousand, seven hundred seventy".