641630332 has 18 divisors (see below), whose sum is σ = 1283528792. Its totient is φ = 274926984.

The previous prime is 641630309. The next prime is 641630351. The reversal of 641630332 is 233036146.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a self number, because there is not a number n which added to its sum of digits gives 641630332.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 131643 + ... + 136429.

Almost surely, 2^641630332 is an apocalyptic number.

It is an amenable number.

641630332 is an abundant number, since it is smaller than the sum of its proper divisors (641898460).

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

641630332 is an frugal number, since it uses more digits than its factorization.

641630332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9585 (or 4796 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 28.

The square root of 641630332 is about 25330.4230521324. The cubic root of 641630332 is about 862.5050146596.

Multiplying 641630332 by its sum of digits (28), we get a square (17965649296 = 134036²).

641630332 divided by its sum of digits (28) gives a square (22915369 = 4787²).

Adding to 641630332 its reverse (233036146), we get a palindrome (874666478).

The spelling of 641630332 in words is "six hundred forty-one million, six hundred thirty thousand, three hundred thirty-two".