722008621 has 4 divisors (see below), whose sum is σ = 746905500. Its totient is φ = 697111744.

The previous prime is 722008603. The next prime is 722008633. The reversal of 722008621 is 126800227.

722008621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 126800227 = 1873 ⋅67699.

It can be written as a sum of positive squares in 2 ways, for example, as 183304521 + 538704100 = 13539^2 + 23210^2 .

It is a de Polignac number, because none of the positive numbers 2^k-722008621 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 722008621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (722008691) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12448396 + ... + 12448453.

It is an arithmetic number, because the mean of its divisors is an integer number (186726375).

Almost surely, 2^722008621 is an apocalyptic number.

It is an amenable number.

722008621 is a deficient number, since it is larger than the sum of its proper divisors (24896879).

722008621 is a wasteful number, since it uses less digits than its factorization.

722008621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24896878.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 722008621 is about 26870.2181048089. The cubic root of 722008621 is about 897.1136424629.

Adding to 722008621 its reverse (126800227), we get a palindrome (848808848).

The spelling of 722008621 in words is "seven hundred twenty-two million, eight thousand, six hundred twenty-one".