721477244 has 6 divisors (see below), whose sum is σ = 1262585184. Its totient is φ = 360738620.

The previous prime is 721477243. The next prime is 721477249. The reversal of 721477244 is 442774127.

721477244 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 721477198 and 721477207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721477243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90184652 + ... + 90184659.

It is an arithmetic number, because the mean of its divisors is an integer number (210430864).

Almost surely, 2^721477244 is an apocalyptic number.

It is an amenable number.

721477244 is a deficient number, since it is larger than the sum of its proper divisors (541107940).

721477244 is a wasteful number, since it uses less digits than its factorization.

721477244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180369315 (or 180369313 counting only the distinct ones).

The product of its digits is 87808, while the sum is 38.

The square root of 721477244 is about 26860.3284417745. The cubic root of 721477244 is about 896.8935054096.

The spelling of 721477244 in words is "seven hundred twenty-one million, four hundred seventy-seven thousand, two hundred forty-four".