721066 has 8 divisors (see below), whose sum is σ = 1085760. Its totient is φ = 359148.

The previous prime is 721057. The next prime is 721079. The reversal of 721066 is 660127.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 175 + ... + 1213.

It is an arithmetic number, because the mean of its divisors is an integer number (135720).

2⁷²¹⁰⁶⁶ is an apocalyptic number.

721066 is a deficient number, since it is larger than the sum of its proper divisors (364694).

721066 is a wasteful number, since it uses less digits than its factorization.

721066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1388.

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 721066 is about 849.1560516183. The cubic root of 721066 is about 89.6723062438.

The spelling of 721066 in words is "seven hundred twenty-one thousand, sixty-six".