721960 has 16 divisors (see below), whose sum is σ = 1624500. Its totient is φ = 288768.

The previous prime is 721951. The next prime is 721961. The reversal of 721960 is 69127.

It can be written as a sum of positive squares in 2 ways, for example, as 708964 + 12996 = 842^2 + 114^2 .

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

721960 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8985 + ... + 9064.

2⁷²¹⁹⁶⁰ is an apocalyptic number.

It is an amenable number.

721960 is an abundant number, since it is smaller than the sum of its proper divisors (902540).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

721960 is a wasteful number, since it uses less digits than its factorization.

721960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18060 (or 18056 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 721960 is about 849.6822935662. The cubic root of 721960 is about 89.7093504411.

It can be divided in two parts, 721 and 960, that added together give a square (1681 = 41²).

The spelling of 721960 in words is "seven hundred twenty-one thousand, nine hundred sixty".