261790 has 16 divisors (see below), whose sum is σ = 482112. Its totient is φ = 102304.

The previous prime is 261787. The next prime is 261791. The reversal of 261790 is 97162.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261791) 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, 192 + ... + 748.

It is an arithmetic number, because the mean of its divisors is an integer number (30132).

2²⁶¹⁷⁹⁰ is an apocalyptic number.

261790 is a deficient number, since it is larger than the sum of its proper divisors (220322).

261790 is a wasteful number, since it uses less digits than its factorization.

261790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 611.

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 261790 is about 511.6541800865. The cubic root of 261790 is about 63.9711784288.

The spelling of 261790 in words is "two hundred sixty-one thousand, seven hundred ninety".