721480 has 32 divisors (see below), whose sum is σ = 1720440. Its totient is φ = 271360.

The previous prime is 721451. The next prime is 721481. The reversal of 721480 is 84127.

It can be written as a sum of positive squares in 4 ways, for example, as 682276 + 39204 = 826^2 + 198^2 .

It is not an unprimeable number, because it can be changed into a prime (721481) 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, 150 + ... + 1210.

2⁷²¹⁴⁸⁰ 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 721480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (860220).

721480 is an abundant number, since it is smaller than the sum of its proper divisors (998960).

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

721480 is a wasteful number, since it uses less digits than its factorization.

721480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1089 (or 1085 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 22.

The square root of 721480 is about 849.3997880857. The cubic root of 721480 is about 89.6894647435.

The spelling of 721480 in words is "seven hundred twenty-one thousand, four hundred eighty".