721104 has 40 divisors (see below), whose sum is σ = 1895712. Its totient is φ = 236160.

The previous prime is 721087. The next prime is 721109. The reversal of 721104 is 401127.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 721104.

It is not an unprimeable number, because it can be changed into a prime (721109) 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, 3894 + ... + 4074.

2⁷²¹¹⁰⁴ 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 721104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (947856).

721104 is an abundant number, since it is smaller than the sum of its proper divisors (1174608).

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

721104 is a wasteful number, since it uses less digits than its factorization.

721104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275 (or 269 counting only the distinct ones).

The product of its (nonzero) digits is 56, while the sum is 15.

The square root of 721104 is about 849.1784264806. The cubic root of 721104 is about 89.6738814523.

It can be divided in two parts, 72 and 1104, that added together give a triangular number (1176 = T₄₈).

The spelling of 721104 in words is "seven hundred twenty-one thousand, one hundred four", and thus it is an iban number.