641219544 has 128 divisors (see below), whose sum is σ = 2044300800. Its totient is φ = 182424960.

The previous prime is 641219503. The next prime is 641219561. The reversal of 641219544 is 445912146.

641219544 is a `hidden beast` number, since 641 + 2 + 1 + 9 + 5 + 4 + 4 = 666.

641219544 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×641219544² = 822325007215135872, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 641219499 and 641219508.

It is a congruent number.

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, 418059 + ... + 419589.

It is an arithmetic number, because the mean of its divisors is an integer number (15971100).

Almost surely, 2^641219544 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 641219544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1022150400).

641219544 is an abundant number, since it is smaller than the sum of its proper divisors (1403081256).

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

641219544 is a wasteful number, since it uses less digits than its factorization.

641219544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1830 (or 1820 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 641219544 is about 25322.3131644801. The cubic root of 641219544 is about 862.3209095079.

The spelling of 641219544 in words is "six hundred forty-one million, two hundred nineteen thousand, five hundred forty-four".