721336606 has 16 divisors (see below), whose sum is σ = 1100601216. Its totient is φ = 354493656.

The previous prime is 721336591. The next prime is 721336607. The reversal of 721336606 is 606633127.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721336607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56815 + ... + 68341.

It is an arithmetic number, because the mean of its divisors is an integer number (68787576).

Almost surely, 2^721336606 is an apocalyptic number.

721336606 is a deficient number, since it is larger than the sum of its proper divisors (379264610).

721336606 is a wasteful number, since it uses less digits than its factorization.

721336606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12063.

The product of its (nonzero) digits is 27216, while the sum is 34.

The square root of 721336606 is about 26857.7103640649. The cubic root of 721336606 is about 896.8352242895.

The spelling of 721336606 in words is "seven hundred twenty-one million, three hundred thirty-six thousand, six hundred six".