721360 has 40 divisors (see below), whose sum is σ = 1714176. Its totient is φ = 282240.

The previous prime is 721351. The next prime is 721363. The reversal of 721360 is 63127.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721363) by changing a digit.

721360 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 7 ways as a sum of consecutive naturals, for example, 5617 + ... + 5743.

2⁷²¹³⁶⁰ 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 721360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (857088).

721360 is an abundant number, since it is smaller than the sum of its proper divisors (992816).

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

721360 is a wasteful number, since it uses less digits than its factorization.

721360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211 (or 205 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 19.

The square root of 721360 is about 849.3291470331. The cubic root of 721360 is about 89.6844919410.

Adding to 721360 its reverse (63127), we get a palindrome (784487).

It can be divided in two parts, 721 and 360, that multiplied together give a triangular number (259560 = T₇₂₀).

The spelling of 721360 in words is "seven hundred twenty-one thousand, three hundred sixty".