721631662 has 8 divisors (see below), whose sum is σ = 1096149600. Its totient is φ = 356248464.

The previous prime is 721631641. The next prime is 721631663. The reversal of 721631662 is 266136127.

It is a happy number.

721631662 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721631663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2283487 + ... + 2283802.

It is an arithmetic number, because the mean of its divisors is an integer number (137018700).

Almost surely, 2^721631662 is an apocalyptic number.

721631662 is a deficient number, since it is larger than the sum of its proper divisors (374517938).

721631662 is a wasteful number, since it uses less digits than its factorization.

721631662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4567370.

The product of its digits is 18144, while the sum is 34.

The square root of 721631662 is about 26863.2027502307. The cubic root of 721631662 is about 896.9574883108.

Adding to 721631662 its reverse (266136127), we get a palindrome (987767789).

The spelling of 721631662 in words is "seven hundred twenty-one million, six hundred thirty-one thousand, six hundred sixty-two".