261727684 has 9 divisors (see below), whose sum is σ = 458080077. Its totient is φ = 130847664.

The previous prime is 261727657. The next prime is 261727691. The reversal of 261727684 is 486727162.

The square root of 261727684 is 16178.

It is a perfect power (a square), and thus also a powerful number.

261727684 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 only one way, i.e., 3161284 + 258566400 = 1778^2 + 16080^2 .

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 261727684.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 28312 + ... + 36400.

Almost surely, 2^261727684 is an apocalyptic number.

261727684 is the 16178-th square number.

It is an amenable number.

261727684 is a deficient number, since it is larger than the sum of its proper divisors (196352393).

261727684 is an frugal number, since it uses more digits than its factorization.

261727684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16182 (or 8091 counting only the distinct ones).

The product of its digits is 225792, while the sum is 43.

The cubic root of 261727684 is about 639.6610216625.

It can be divided in two parts, 26172 and 7684, that added together give a square (33856 = 184²).

The spelling of 261727684 in words is "two hundred sixty-one million, seven hundred twenty-seven thousand, six hundred eighty-four".