721296 has 30 divisors (see below), whose sum is σ = 2019030. Its totient is φ = 240384.

The previous prime is 721291. The next prime is 721307. The reversal of 721296 is 692127.

721296 is nontrivially palindromic in base 5.

It can be written as a sum of positive squares in only one way, i.e., 608400 + 112896 = 780^2 + 336^2 .

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (721291) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2361 + ... + 2648.

It is an arithmetic number, because the mean of its divisors is an integer number (67301).

2⁷²¹²⁹⁶ is an apocalyptic number.

It is an amenable number.

721296 is an abundant number, since it is smaller than the sum of its proper divisors (1297734).

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

721296 is a wasteful number, since it uses less digits than its factorization.

721296 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5023 (or 5014 counting only the distinct ones).

The product of its digits is 1512, while the sum is 27.

The square root of 721296 is about 849.2914694026. The cubic root of 721296 is about 89.6818395542.

The spelling of 721296 in words is "seven hundred twenty-one thousand, two hundred ninety-six".