721081682 has 16 divisors (see below), whose sum is σ = 1096156320. Its totient is φ = 355728672.

The previous prime is 721081681. The next prime is 721081693. The reversal of 721081682 is 286180127.

It is not an unprimeable number, because it can be changed into a prime (721081681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37358 + ... + 53270.

It is an arithmetic number, because the mean of its divisors is an integer number (68509770).

Almost surely, 2^721081682 is an apocalyptic number.

721081682 is a deficient number, since it is larger than the sum of its proper divisors (375074638).

721081682 is a wasteful number, since it uses less digits than its factorization.

721081682 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16217.

The product of its (nonzero) digits is 10752, while the sum is 35.

The square root of 721081682 is about 26852.9641194413. The cubic root of 721081682 is about 896.7295631421.

The spelling of 721081682 in words is "seven hundred twenty-one million, eighty-one thousand, six hundred eighty-two".