814646721 has 16 divisors (see below), whose sum is σ = 1248307200. Its totient is φ = 462909648.

The previous prime is 814646713. The next prime is 814646731. The reversal of 814646721 is 127646418.

It is not a de Polignac number, because 814646721 - 2³ = 814646713 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 814646721.

It is not an unprimeable number, because it can be changed into a prime (814646731) 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, 104601 + ... + 112118.

It is an arithmetic number, because the mean of its divisors is an integer number (78019200).

Almost surely, 2^814646721 is an apocalyptic number.

It is an amenable number.

814646721 is a deficient number, since it is larger than the sum of its proper divisors (433660479).

814646721 is a wasteful number, since it uses less digits than its factorization.

814646721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216908.

The product of its digits is 64512, while the sum is 39.

The square root of 814646721 is about 28542.0167647628. The cubic root of 814646721 is about 933.9488777812.

The spelling of 814646721 in words is "eight hundred fourteen million, six hundred forty-six thousand, seven hundred twenty-one".