721548 has 60 divisors (see below), whose sum is σ = 2012472. Its totient is φ = 224640.

The previous prime is 721547. The next prime is 721561. The reversal of 721548 is 845127.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 721548.

It is not an unprimeable number, because it can be changed into a prime (721547) by changing a digit.

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 19 ways as a sum of consecutive naturals, for example, 5443 + ... + 5573.

2⁷²¹⁵⁴⁸ 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 721548, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1006236).

721548 is an abundant number, since it is smaller than the sum of its proper divisors (1290924).

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

721548 is a wasteful number, since it uses less digits than its factorization.

721548 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164 (or 153 counting only the distinct ones).

The product of its digits is 2240, while the sum is 27.

The square root of 721548 is about 849.4398154078. The cubic root of 721548 is about 89.6922824201.

The spelling of 721548 in words is "seven hundred twenty-one thousand, five hundred forty-eight".