641304378 has 320 divisors, whose sum is σ = 1873428480. Its totient is φ = 160963200.

The previous prime is 641304371. The next prime is 641304403. The reversal of 641304378 is 873403146.

641304378 is a `hidden beast` number, since 641 + 3 + 0 + 4 + 3 + 7 + 8 = 666.

641304378 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 2×641304378² = 822542610483933768, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (641304371) by changing a digit.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 13644751 + ... + 13644797.

It is an arithmetic number, because the mean of its divisors is an integer number (5854464).

Almost surely, 2^641304378 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 641304378, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (936714240).

641304378 is an abundant number, since it is smaller than the sum of its proper divisors (1232124102).

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

641304378 is a wasteful number, since it uses less digits than its factorization.

641304378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135 (or 126 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 36.

The square root of 641304378 is about 25323.9881930157. The cubic root of 641304378 is about 862.3589364764.

The spelling of 641304378 in words is "six hundred forty-one million, three hundred four thousand, three hundred seventy-eight".