723720 has 64 divisors (see below), whose sum is σ = 2243520. Its totient is φ = 186624.

The previous prime is 723661. The next prime is 723721. The reversal of 723720 is 27327.

723720 = T₁₇₉ + T₁₈₀ + ... + T₂₁₅.

It is not an unprimeable number, because it can be changed into a prime (723721) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 4359 + ... + 4521.

It is an arithmetic number, because the mean of its divisors is an integer number (35055).

2⁷²³⁷²⁰ 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 723720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1121760).

723720 is an abundant number, since it is smaller than the sum of its proper divisors (1519800).

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

723720 is a wasteful number, since it uses less digits than its factorization.

723720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214 (or 210 counting only the distinct ones).

The product of its (nonzero) digits is 588, while the sum is 21.

The square root of 723720 is about 850.7173443630. The cubic root of 723720 is about 89.7821893471.

The spelling of 723720 in words is "seven hundred twenty-three thousand, seven hundred twenty", and thus it is an iban number.