261670 has 16 divisors (see below), whose sum is σ = 476928. Its totient is φ = 103360.

The previous prime is 261643. The next prime is 261673. The reversal of 261670 is 76162.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261673) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1275 + ... + 1465.

It is an arithmetic number, because the mean of its divisors is an integer number (29808).

2²⁶¹⁶⁷⁰ is an apocalyptic number.

261670 is a deficient number, since it is larger than the sum of its proper divisors (215258).

261670 is a wasteful number, since it uses less digits than its factorization.

261670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335.

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 261670 is about 511.5368999398. The cubic root of 261670 is about 63.9614025083.

The spelling of 261670 in words is "two hundred sixty-one thousand, six hundred seventy".