722807638 has 16 divisors (see below), whose sum is σ = 1239473664. Its totient is φ = 309681000.

The previous prime is 722807627. The next prime is 722807639. The reversal of 722807638 is 836708227.

722807638 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×722807638² = 1044901763102278088, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 722807594 and 722807603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (722807639) 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, 61081 + ... + 71947.

It is an arithmetic number, because the mean of its divisors is an integer number (77467104).

Almost surely, 2^722807638 is an apocalyptic number.

722807638 is a deficient number, since it is larger than the sum of its proper divisors (516666026).

722807638 is a wasteful number, since it uses less digits than its factorization.

722807638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15627.

The product of its (nonzero) digits is 225792, while the sum is 43.

The square root of 722807638 is about 26885.0820716620. The cubic root of 722807638 is about 897.4444532833. Note that the first 4 decimals are identical.

The spelling of 722807638 in words is "seven hundred twenty-two million, eight hundred seven thousand, six hundred thirty-eight".