641577894 has 8 divisors (see below), whose sum is σ = 1283155800. Its totient is φ = 213859296.

The previous prime is 641577887. The next prime is 641577899. The reversal of 641577894 is 498775146.

It is a sphenic number, since it is the product of 3 distinct primes.

641577894 is an admirable number.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641577899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53464819 + ... + 53464830.

It is an arithmetic number, because the mean of its divisors is an integer number (160394475).

Almost surely, 2^641577894 is an apocalyptic number.

641577894 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

641577894 is a wasteful number, since it uses less digits than its factorization.

641577894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106929654.

The product of its digits is 1693440, while the sum is 51.

The square root of 641577894 is about 25329.3879515475. The cubic root of 641577894 is about 862.4815176044.

The spelling of 641577894 in words is "six hundred forty-one million, five hundred seventy-seven thousand, eight hundred ninety-four".