721382606 has 48 divisors (see below), whose sum is σ = 1280448000. Its totient is φ = 303887808.

The previous prime is 721382593. The next prime is 721382609. The reversal of 721382606 is 606283127.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721382609) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1854260 + ... + 1854648.

It is an arithmetic number, because the mean of its divisors is an integer number (26676000).

Almost surely, 2^721382606 is an apocalyptic number.

721382606 is a deficient number, since it is larger than the sum of its proper divisors (559065394).

721382606 is a wasteful number, since it uses less digits than its factorization.

721382606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 681 (or 674 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 721382606 is about 26858.5667152959. The cubic root of 721382606 is about 896.8542877628.

The spelling of 721382606 in words is "seven hundred twenty-one million, three hundred eighty-two thousand, six hundred six".