641213216 has 72 divisors (see below), whose sum is σ = 1545853680. Its totient is φ = 260330112.

The previous prime is 641213203. The next prime is 641213231. The reversal of 641213216 is 612312146.

It is a super-2 number, since 2×641213216² = 822308776746125312, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19031 + ... + 40553.

It is an arithmetic number, because the mean of its divisors is an integer number (21470190).

Almost surely, 2^641213216 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 641213216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (772926840).

641213216 is an abundant number, since it is smaller than the sum of its proper divisors (904640464).

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

641213216 is a wasteful number, since it uses less digits than its factorization.

641213216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21566 (or 21551 counting only the distinct ones).

The product of its digits is 1728, while the sum is 26.

The square root of 641213216 is about 25322.1882150813. The cubic root of 641213216 is about 862.3180728379.

The spelling of 641213216 in words is "six hundred forty-one million, two hundred thirteen thousand, two hundred sixteen".