641155104 has 72 divisors (see below), whose sum is σ = 1827211932. Its totient is φ = 213258240.

The previous prime is 641155091. The next prime is 641155111. The reversal of 641155104 is 401551146.

641155104 is a `hidden beast` number, since 641 + 1 + 5 + 5 + 10 + 4 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 608115600 + 33039504 = 24660^2 + 5748^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is a super-2 number, since 2×641155104² = 822159734770501632, 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, 147912 + ... + 152184.

Almost surely, 2^641155104 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 641155104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (913605966).

641155104 is an abundant number, since it is smaller than the sum of its proper divisors (1186056828).

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

641155104 is a wasteful number, since it uses less digits than its factorization.

641155104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4810 (or 4799 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 641155104 is about 25321.0407369050. The cubic root of 641155104 is about 862.2920219391.

The spelling of 641155104 in words is "six hundred forty-one million, one hundred fifty-five thousand, one hundred four".