622320721 has 8 divisors (see below), whose sum is σ = 679125888. Its totient is φ = 565554000.

The previous prime is 622320709. The next prime is 622320733. The reversal of 622320721 is 127023226.

622320721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (622320709) and next prime (622320733).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 622320721 - 2¹¹ = 622318673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (622320791) 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, 32151 + ... + 47731.

It is an arithmetic number, because the mean of its divisors is an integer number (84890736).

Almost surely, 2^622320721 is an apocalyptic number.

It is an amenable number.

622320721 is a deficient number, since it is larger than the sum of its proper divisors (56805167).

622320721 is a wasteful number, since it uses less digits than its factorization.

622320721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19223.

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 622320721 is about 24946.3568682884. The cubic root of 622320721 is about 853.7644893348.

Adding to 622320721 its reverse (127023226), we get a palindrome (749343947).

The spelling of 622320721 in words is "six hundred twenty-two million, three hundred twenty thousand, seven hundred twenty-one".