723536 has 20 divisors (see below), whose sum is σ = 1529664. Its totient is φ = 328800.

The previous prime is 723529. The next prime is 723551. The reversal of 723536 is 635327.

It is a congruent number.

It is an unprimeable number.

723536 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 in 3 ways as a sum of consecutive naturals, for example, 1880 + ... + 2231.

2⁷²³⁵³⁶ is an apocalyptic number.

It is an amenable number.

723536 is an abundant number, since it is smaller than the sum of its proper divisors (806128).

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

723536 is a wasteful number, since it uses less digits than its factorization.

723536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4130 (or 4124 counting only the distinct ones).

The product of its digits is 3780, while the sum is 26.

The square root of 723536 is about 850.6091934608. The cubic root of 723536 is about 89.7745799019.

Subtracting from 723536 its reverse (635327), we obtain a square (88209 = 297²).

The spelling of 723536 in words is "seven hundred twenty-three thousand, five hundred thirty-six".