641443630 has 32 divisors (see below), whose sum is σ = 1214362368. Its totient is φ = 243609600.

The previous prime is 641443603. The next prime is 641443633. The reversal of 641443630 is 36344146.

It is a happy number.

It is a super-2 number, since 2×641443630² = 822899860935153800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a junction number, because it is equal to n+sod(n) for n = 641443592 and 641443601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641443633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3091 + ... + 35950.

It is an arithmetic number, because the mean of its divisors is an integer number (37948824).

Almost surely, 2^641443630 is an apocalyptic number.

641443630 is a deficient number, since it is larger than the sum of its proper divisors (572918738).

641443630 is a wasteful number, since it uses less digits than its factorization.

641443630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39132.

The product of its (nonzero) digits is 20736, while the sum is 31.

The square root of 641443630 is about 25326.7374527395. The cubic root of 641443630 is about 862.4213491258.

Adding to 641443630 its reverse (36344146), we get a palindrome (677787776).

The spelling of 641443630 in words is "six hundred forty-one million, four hundred forty-three thousand, six hundred thirty".