630530640 has 120 divisors (see below), whose sum is σ = 2153567520. Its totient is φ = 165280512.

The previous prime is 630530639. The next prime is 630530647. The reversal of 630530640 is 46035036.

It is a tau number, because it is divible by the number of its divisors (120).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (630530647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 35059 + ... + 49901.

It is an arithmetic number, because the mean of its divisors is an integer number (17946396).

Almost surely, 2^630530640 is an apocalyptic number.

630530640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 630530640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1076783760).

630530640 is an abundant number, since it is smaller than the sum of its proper divisors (1523036880).

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

630530640 is a wasteful number, since it uses less digits than its factorization.

630530640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14921 (or 14912 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 27.

The square root of 630530640 is about 25110.3691729134. The cubic root of 630530640 is about 857.5025071680.

Adding to 630530640 its reverse (46035036), we get a palindrome (676565676).

The spelling of 630530640 in words is "six hundred thirty million, five hundred thirty thousand, six hundred forty".