630000018 has 20 divisors (see below), whose sum is σ = 1411667070. Its totient is φ = 209999952.

The previous prime is 630000017. The next prime is 630000067. The reversal of 630000018 is 810000036.

It can be written as a sum of positive squares in only one way, i.e., 624650049 + 5349969 = 24993^2 + 2313^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (630000013) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1944283 + ... + 1944606.

Almost surely, 2^630000018 is an apocalyptic number.

630000018 is an abundant number, since it is smaller than the sum of its proper divisors (781667052).

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

630000018 is a wasteful number, since it uses less digits than its factorization.

630000018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3888903 (or 3888894 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 630000018 is about 25099.8011545908. The cubic root of 630000018 is about 857.2618963957.

Adding to 630000018 its sum of digits (18), we get a palindrome (630000036).

The spelling of 630000018 in words is "six hundred thirty million, eighteen", and thus it is an aban number.