721223448 has 32 divisors (see below), whose sum is σ = 1966973760. Its totient is φ = 218552480.

The previous prime is 721223441. The next prime is 721223471. The reversal of 721223448 is 844322127.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721223441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1365690 + ... + 1366217.

It is an arithmetic number, because the mean of its divisors is an integer number (61467930).

Almost surely, 2^721223448 is an apocalyptic number.

It is an amenable number.

721223448 is an abundant number, since it is smaller than the sum of its proper divisors (1245750312).

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

721223448 is a wasteful number, since it uses less digits than its factorization.

721223448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2731927 (or 2731923 counting only the distinct ones).

The product of its digits is 21504, while the sum is 33.

The square root of 721223448 is about 26855.6036610611. The cubic root of 721223448 is about 896.7883255247.

The spelling of 721223448 in words is "seven hundred twenty-one million, two hundred twenty-three thousand, four hundred forty-eight".