723604 has 24 divisors (see below), whose sum is σ = 1483328. Its totient is φ = 302400.

The previous prime is 723601. The next prime is 723607. The reversal of 723604 is 406327.

723604 = T₈₇ + T₈₈ + ... + T₁₇₀.

723604 = 162² + 163² + ... + 185².

It is an interprime number because it is at equal distance from previous prime (723601) and next prime (723607).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (723601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 904 + ... + 1504.

2⁷²³⁶⁰⁴ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 723604, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (741664).

723604 is an abundant number, since it is smaller than the sum of its proper divisors (759724).

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

723604 is a wasteful number, since it uses less digits than its factorization.

723604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 655 (or 653 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 22.

The square root of 723604 is about 850.6491638743. The cubic root of 723604 is about 89.7773922384. Note that the first 3 decimals are identical.

The spelling of 723604 in words is "seven hundred twenty-three thousand, six hundred four".