722001620 has 12 divisors (see below), whose sum is σ = 1516203444. Its totient is φ = 288800640.

The previous prime is 722001607. The next prime is 722001629. The reversal of 722001620 is 26100227.

722001620 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 353515204 + 368486416 = 18802^2 + 19196^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 36100081 = 722001620 / (7 + 2 + 2 + 0 + 0 + 1 + 6 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 722001592 and 722001601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (722001629) 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, 18050021 + ... + 18050060.

It is an arithmetic number, because the mean of its divisors is an integer number (126350287).

Almost surely, 2^722001620 is an apocalyptic number.

It is an amenable number.

722001620 is an abundant number, since it is smaller than the sum of its proper divisors (794201824).

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

722001620 is a wasteful number, since it uses less digits than its factorization.

722001620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36100090 (or 36100088 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 722001620 is about 26870.0878301505. The cubic root of 722001620 is about 897.1107428147.

Adding to 722001620 its reverse (26100227), we get a palindrome (748101847).

The spelling of 722001620 in words is "seven hundred twenty-two million, one thousand, six hundred twenty".