722642420 has 18 divisors (see below), whose sum is σ = 1517801586. Its totient is φ = 289008880.

The previous prime is 722642419. The next prime is 722642429. The reversal of 722642420 is 24246227.

It is a happy number.

722642420 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 only one way, i.e., 578113936 + 144528484 = 24044^2 + 12022^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (722642429) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 117215 + ... + 123225.

Almost surely, 2^722642420 is an apocalyptic number.

It is an amenable number.

722642420 is an abundant number, since it is smaller than the sum of its proper divisors (795159166).

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

722642420 is an frugal number, since it uses more digits than its factorization.

722642420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12031 (or 6018 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 29.

The square root of 722642420 is about 26882.0092255025. The cubic root of 722642420 is about 897.3760693553.

Adding to 722642420 its reverse (24246227), we get a palindrome (746888647).

The spelling of 722642420 in words is "seven hundred twenty-two million, six hundred forty-two thousand, four hundred twenty".