723520 has 112 divisors (see below), whose sum is σ = 2194560. Its totient is φ = 221184.

The previous prime is 723493. The next prime is 723529. The reversal of 723520 is 25327.

723520 = 11² + 12² + ... + 129².

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (112).

It is a Harshad number since it is a multiple of its sum of digits (19).

It is not an unprimeable number, because it can be changed into a prime (723529) by changing a digit.

723520 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38071 + ... + 38089.

2⁷²³⁵²⁰ is an apocalyptic number.

723520 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 723520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1097280).

723520 is an abundant number, since it is smaller than the sum of its proper divisors (1471040).

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

723520 is a wasteful number, since it uses less digits than its factorization.

723520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60 (or 50 counting only the distinct ones).

The product of its (nonzero) digits is 420, while the sum is 19.

The square root of 723520 is about 850.5997883846. The cubic root of 723520 is about 89.7739181500.

Adding to 723520 its reverse (25327), we get a palindrome (748847).

The spelling of 723520 in words is "seven hundred twenty-three thousand, five hundred twenty".