721260 has 36 divisors (see below), whose sum is σ = 2188368. Its totient is φ = 192288.

The previous prime is 721243. The next prime is 721261. The reversal of 721260 is 62127.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (721261) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1824 + ... + 2183.

It is an arithmetic number, because the mean of its divisors is an integer number (60788).

2⁷²¹²⁶⁰ is an apocalyptic number.

It is an amenable number.

721260 is an abundant number, since it is smaller than the sum of its proper divisors (1467108).

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

721260 is a wasteful number, since it uses less digits than its factorization.

721260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4022 (or 4017 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 721260 is about 849.2702750008. The cubic root of 721260 is about 89.6803475177.

Adding to 721260 its reverse (62127), we get a palindrome (783387).

The spelling of 721260 in words is "seven hundred twenty-one thousand, two hundred sixty".