721684411 has 16 divisors (see below), whose sum is σ = 841549824. Its totient is φ = 606045024.

The previous prime is 721684393. The next prime is 721684421. The reversal of 721684411 is 114486127.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 721684411 - 2¹¹ = 721682363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (721684421) 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, 506446 + ... + 507868.

It is an arithmetic number, because the mean of its divisors is an integer number (52596864).

Almost surely, 2^721684411 is an apocalyptic number.

721684411 is a deficient number, since it is larger than the sum of its proper divisors (119865413).

721684411 is a wasteful number, since it uses less digits than its factorization.

721684411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2850.

The product of its digits is 10752, while the sum is 34.

The square root of 721684411 is about 26864.1845400154. The cubic root of 721684411 is about 896.9793427001.

The spelling of 721684411 in words is "seven hundred twenty-one million, six hundred eighty-four thousand, four hundred eleven".