641216620 has 48 divisors (see below), whose sum is σ = 1489694976. Its totient is φ = 229880000.

The previous prime is 641216603. The next prime is 641216621. The reversal of 641216620 is 26612146.

It is a super-2 number, since 2×641216620² = 822317507528448800, which contains 22 as substring.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (641216621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4906 + ... + 36145.

It is an arithmetic number, because the mean of its divisors is an integer number (31035312).

Almost surely, 2^641216620 is an apocalyptic number.

It is an amenable number.

641216620 is an abundant number, since it is smaller than the sum of its proper divisors (848478356).

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

641216620 is a wasteful number, since it uses less digits than its factorization.

641216620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41142 (or 41140 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 641216620 is about 25322.2554287725. The cubic root of 641216620 is about 862.3195987607.

Adding to 641216620 its reverse (26612146), we get a palindrome (667828766).

It can be divided in two parts, 6412 and 16620, that added together give a palindrome (23032).

The spelling of 641216620 in words is "six hundred forty-one million, two hundred sixteen thousand, six hundred twenty".