721964 has 6 divisors (see below), whose sum is σ = 1263444. Its totient is φ = 360980.

The previous prime is 721961. The next prime is 721979. The reversal of 721964 is 469127.

It is not an unprimeable number, because it can be changed into a prime (721961) by changing a digit.

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 as a sum of consecutive naturals, namely, 90242 + ... + 90249.

It is an arithmetic number, because the mean of its divisors is an integer number (210574).

2⁷²¹⁹⁶⁴ is an apocalyptic number.

It is an amenable number.

721964 is a deficient number, since it is larger than the sum of its proper divisors (541480).

721964 is a wasteful number, since it uses less digits than its factorization.

721964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180495 (or 180493 counting only the distinct ones).

The product of its digits is 3024, while the sum is 29.

The square root of 721964 is about 849.6846473840. The cubic root of 721964 is about 89.7095161182.

The spelling of 721964 in words is "seven hundred twenty-one thousand, nine hundred sixty-four".