641385668 has 36 divisors (see below), whose sum is σ = 1409995776. Its totient is φ = 249889200.

The previous prime is 641385649. The next prime is 641385677. The reversal of 641385668 is 866583146.

It is a super-2 number, since 2×641385668² = 822751150231612448, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 91268 + ... + 98043.

Almost surely, 2^641385668 is an apocalyptic number.

It is an amenable number.

641385668 is an abundant number, since it is smaller than the sum of its proper divisors (768610108).

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

641385668 is a wasteful number, since it uses less digits than its factorization.

641385668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189344 (or 189331 counting only the distinct ones).

The product of its digits is 829440, while the sum is 47.

The square root of 641385668 is about 25325.5931421161. The cubic root of 641385668 is about 862.3953716953.

The spelling of 641385668 in words is "six hundred forty-one million, three hundred eighty-five thousand, six hundred sixty-eight".