721064 has 16 divisors (see below), whose sum is σ = 1362420. Its totient is φ = 357760.

The previous prime is 721057. The next prime is 721079. The reversal of 721064 is 460127.

It can be written as a sum of positive squares in 2 ways, for example, as 708964 + 12100 = 842^2 + 110^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1124 + ... + 1644.

2⁷²¹⁰⁶⁴ is an apocalyptic number.

It is an amenable number.

721064 is a deficient number, since it is larger than the sum of its proper divisors (641356).

721064 is a wasteful number, since it uses less digits than its factorization.

721064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 700 (or 696 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 721064 is about 849.1548739777. The cubic root of 721064 is about 89.6722233366.

The spelling of 721064 in words is "seven hundred twenty-one thousand, sixty-four".