722641 has 4 divisors (see below), whose sum is σ = 745984. Its totient is φ = 699300.

The previous prime is 722639. The next prime is 722663. The reversal of 722641 is 146227.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 722641 - 2¹ = 722639 is a prime.

It is not an unprimeable number, because it can be changed into a prime (722611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11625 + ... + 11686.

It is an arithmetic number, because the mean of its divisors is an integer number (186496).

2⁷²²⁶⁴¹ is an apocalyptic number.

It is an amenable number.

722641 is a deficient number, since it is larger than the sum of its proper divisors (23343).

722641 is a wasteful number, since it uses less digits than its factorization.

722641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23342.

The product of its digits is 672, while the sum is 22.

The square root of 722641 is about 850.0829371303. The cubic root of 722641 is about 89.7375481570.

Adding to 722641 its reverse (146227), we get a palindrome (868868).

The spelling of 722641 in words is "seven hundred twenty-two thousand, six hundred forty-one".