723128 has 32 divisors (see below), whose sum is σ = 1596000. Its totient is φ = 300672.

The previous prime is 723127. The next prime is 723133. The reversal of 723128 is 821327.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (723127) 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, 1898 + ... + 2246.

It is an arithmetic number, because the mean of its divisors is an integer number (49875).

2⁷²³¹²⁸ 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 723128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (798000).

723128 is an abundant number, since it is smaller than the sum of its proper divisors (872872).

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

723128 is a wasteful number, since it uses less digits than its factorization.

723128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399 (or 395 counting only the distinct ones).

The product of its digits is 672, while the sum is 23.

The square root of 723128 is about 850.3693315260. The cubic root of 723128 is about 89.7577021812.

The spelling of 723128 in words is "seven hundred twenty-three thousand, one hundred twenty-eight".