641163684 has 96 divisors (see below), whose sum is σ = 1765048320. Its totient is φ = 177360768.

The previous prime is 641163673. The next prime is 641163701. The reversal of 641163684 is 486361146.

It is a super-2 number, since 2×641163684² = 822181739360903712, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 350797 + ... + 352619.

It is an arithmetic number, because the mean of its divisors is an integer number (18385920).

Almost surely, 2^641163684 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 641163684, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (882524160).

641163684 is an abundant number, since it is smaller than the sum of its proper divisors (1123884636).

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

641163684 is a wasteful number, since it uses less digits than its factorization.

641163684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1969 (or 1967 counting only the distinct ones).

The product of its digits is 82944, while the sum is 39.

The square root of 641163684 is about 25321.2101606539. The cubic root of 641163684 is about 862.2958683472.

The spelling of 641163684 in words is "six hundred forty-one million, one hundred sixty-three thousand, six hundred eighty-four".