784721313 has 6 divisors (see below), whose sum is σ = 1133486354. Its totient is φ = 523147536.

The previous prime is 784721281. The next prime is 784721347. The reversal of 784721313 is 313127487.

It can be written as a sum of positive squares in only one way, i.e., 738915489 + 45805824 = 27183^2 + 6768^2 .

It is not a de Polignac number, because 784721313 - 2⁵ = 784721281 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (784721363) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 43595620 + ... + 43595637.

Almost surely, 2^784721313 is an apocalyptic number.

It is an amenable number.

784721313 is a deficient number, since it is larger than the sum of its proper divisors (348765041).

784721313 is a wasteful number, since it uses less digits than its factorization.

784721313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87191263 (or 87191260 counting only the distinct ones).

The product of its digits is 28224, while the sum is 36.

The square root of 784721313 is about 28012.8776279767. The cubic root of 784721313 is about 922.3699580942.

The spelling of 784721313 in words is "seven hundred eighty-four million, seven hundred twenty-one thousand, three hundred thirteen".