260640818 has 4 divisors (see below), whose sum is σ = 390961230. Its totient is φ = 130320408.

The previous prime is 260640817. The next prime is 260640823. The reversal of 260640818 is 818046062.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 205836409 + 54804409 = 14347^2 + 7403^2 .

It is not an unprimeable number, because it can be changed into a prime (260640811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65160203 + ... + 65160206.

Almost surely, 2^260640818 is an apocalyptic number.

260640818 is a deficient number, since it is larger than the sum of its proper divisors (130320412).

260640818 is a wasteful number, since it uses less digits than its factorization.

260640818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130320411.

The product of its (nonzero) digits is 18432, while the sum is 35.

The square root of 260640818 is about 16144.3741904107. The cubic root of 260640818 is about 638.7743616843.

The spelling of 260640818 in words is "two hundred sixty million, six hundred forty thousand, eight hundred eighteen".