261712726 has 48 divisors (see below), whose sum is σ = 467002368. Its totient is φ = 108961200.

The previous prime is 261712723. The next prime is 261712741. The reversal of 261712726 is 627217162.

It is a junction number, because it is equal to n+sod(n) for n = 261712691 and 261712700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261712723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 245671 + ... + 246733.

It is an arithmetic number, because the mean of its divisors is an integer number (9729216).

Almost surely, 2^261712726 is an apocalyptic number.

261712726 is a deficient number, since it is larger than the sum of its proper divisors (205289642).

261712726 is a wasteful number, since it uses less digits than its factorization.

261712726 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1145 (or 1126 counting only the distinct ones).

The product of its digits is 14112, while the sum is 34.

The square root of 261712726 is about 16177.5376989207. The cubic root of 261712726 is about 639.6488356737.

Adding to 261712726 its reverse (627217162), we get a palindrome (888929888).

The spelling of 261712726 in words is "two hundred sixty-one million, seven hundred twelve thousand, seven hundred twenty-six".