261662 has 8 divisors (see below), whose sum is σ = 402192. Its totient is φ = 127600.

The previous prime is 261643. The next prime is 261673. The reversal of 261662 is 266162.

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

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 3 ways as a sum of consecutive naturals, for example, 1514 + ... + 1677.

It is an arithmetic number, because the mean of its divisors is an integer number (50274).

2²⁶¹⁶⁶² is an apocalyptic number.

261662 is a deficient number, since it is larger than the sum of its proper divisors (140530).

261662 is a wasteful number, since it uses less digits than its factorization.

261662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3234.

The product of its digits is 864, while the sum is 23.

The square root of 261662 is about 511.5290803073. The cubic root of 261662 is about 63.9607506740.

The spelling of 261662 in words is "two hundred sixty-one thousand, six hundred sixty-two".