260639813 has 16 divisors (see below), whose sum is σ = 306151296. Its totient is φ = 217244160.

The previous prime is 260639783. The next prime is 260639839. The reversal of 260639813 is 318936062.

It is not a de Polignac number, because 260639813 - 2⁸ = 260639557 is a prime.

It is a super-2 number, since 2×260639813² = 135866224241349938, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (260639843) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70745 + ... + 74337.

It is an arithmetic number, because the mean of its divisors is an integer number (19134456).

Almost surely, 2^260639813 is an apocalyptic number.

It is an amenable number.

260639813 is a deficient number, since it is larger than the sum of its proper divisors (45511483).

260639813 is a wasteful number, since it uses less digits than its factorization.

260639813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3884.

The product of its (nonzero) digits is 46656, while the sum is 38.

The square root of 260639813 is about 16144.3430649872. The cubic root of 260639813 is about 638.7735406706.

The spelling of 260639813 in words is "two hundred sixty million, six hundred thirty-nine thousand, eight hundred thirteen".