630728123 has 8 divisors (see below), whose sum is σ = 666093120. Its totient is φ = 595580040.

The previous prime is 630728099. The next prime is 630728141. The reversal of 630728123 is 321827036.

It is a happy number.

630728123 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 630728123 - 2¹⁰ = 630727099 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 630728123.

It is not an unprimeable number, because it can be changed into a prime (630728023) 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, 48233 + ... + 59898.

It is an arithmetic number, because the mean of its divisors is an integer number (83261640).

Almost surely, 2^630728123 is an apocalyptic number.

630728123 is a deficient number, since it is larger than the sum of its proper divisors (35364997).

630728123 is a wasteful number, since it uses less digits than its factorization.

630728123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108457.

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 630728123 is about 25114.3011648742. The cubic root of 630728123 is about 857.5920214493.

The spelling of 630728123 in words is "six hundred thirty million, seven hundred twenty-eight thousand, one hundred twenty-three".