722653 has 4 divisors (see below), whose sum is σ = 765180. Its totient is φ = 680128.

The previous prime is 722639. The next prime is 722663. The reversal of 722653 is 356227.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 356227 = 101 ⋅3527.

It can be written as a sum of positive squares in 2 ways, for example, as 636804 + 85849 = 798^2 + 293^2 .

It is a cyclic number.

It is not a de Polignac number, because 722653 - 2¹⁷ = 591581 is a prime.

It is a d-powerful number, because it can be written as 7³ + 2¹⁷ + 6⁵ + 2¹⁹ + 5³ + 3¹⁰ .

It is a Duffinian number.

722653 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (722633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21238 + ... + 21271.

It is an arithmetic number, because the mean of its divisors is an integer number (191295).

2⁷²²⁶⁵³ is an apocalyptic number.

It is an amenable number.

722653 is a deficient number, since it is larger than the sum of its proper divisors (42527).

722653 is a wasteful number, since it uses less digits than its factorization.

722653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42526.

The product of its digits is 2520, while the sum is 25.

The square root of 722653 is about 850.0899952358. The cubic root of 722653 is about 89.7380448742.

The spelling of 722653 in words is "seven hundred twenty-two thousand, six hundred fifty-three".