261040636 has 6 divisors (see below), whose sum is σ = 456821120. Its totient is φ = 130520316.

The previous prime is 261040621. The next prime is 261040657. The reversal of 261040636 is 636040162.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32630076 + ... + 32630083.

Almost surely, 2^261040636 is an apocalyptic number.

It is an amenable number.

261040636 is a deficient number, since it is larger than the sum of its proper divisors (195780484).

261040636 is a wasteful number, since it uses less digits than its factorization.

261040636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65260163 (or 65260161 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 261040636 is about 16156.7520250823. The cubic root of 261040636 is about 639.1008173425.

Adding to 261040636 its reverse (636040162), we get a palindrome (897080798).

The spelling of 261040636 in words is "two hundred sixty-one million, forty thousand, six hundred thirty-six".