641143404 has 96 divisors (see below), whose sum is σ = 1857703680. Its totient is φ = 189532800.

The previous prime is 641143357. The next prime is 641143409. The reversal of 641143404 is 404341146.

641143404 is a `hidden beast` number, since 641 + 14 + 3 + 4 + 0 + 4 = 666.

It is a super-2 number, since 2×641143404² = 822129728985414432, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (641143409) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 42127 + ... + 55289.

It is an arithmetic number, because the mean of its divisors is an integer number (19351080).

Almost surely, 2^641143404 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 641143404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (928851840).

641143404 is an abundant number, since it is smaller than the sum of its proper divisors (1216560276).

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

641143404 is a wasteful number, since it uses less digits than its factorization.

641143404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13228 (or 13220 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 641143404 is about 25320.8097026932. The cubic root of 641143404 is about 862.2867767819.

The spelling of 641143404 in words is "six hundred forty-one million, one hundred forty-three thousand, four hundred four".