260640816 has 40 divisors (see below), whose sum is σ = 674633904. Its totient is φ = 86711040.

The previous prime is 260640811. The next prime is 260640817. The reversal of 260640816 is 618046062.

It is a happy number.

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

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20950 + ... + 30986.

Almost surely, 2^260640816 is an apocalyptic number.

It is an amenable number.

260640816 is an abundant number, since it is smaller than the sum of its proper divisors (413993088).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

260640816 is a wasteful number, since it uses less digits than its factorization.

260640816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10589 (or 10583 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 260640816 is about 16144.3741284696. The cubic root of 260640816 is about 638.7743600505.

Adding to 260640816 its reverse (618046062), we get a palindrome (878686878).

The spelling of 260640816 in words is "two hundred sixty million, six hundred forty thousand, eight hundred sixteen".