641387056 has 20 divisors (see below), whose sum is σ = 1243112400. Its totient is φ = 320583872.

The previous prime is 641387029. The next prime is 641387063. The reversal of 641387056 is 650783146.

It is a happy number.

It is a super-3 number, since 3×641387056³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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 3 ways as a sum of consecutive naturals, for example, 62925 + ... + 72403.

It is an arithmetic number, because the mean of its divisors is an integer number (62155620).

Almost surely, 2^641387056 is an apocalyptic number.

It is an amenable number.

641387056 is a deficient number, since it is larger than the sum of its proper divisors (601725344).

641387056 is a wasteful number, since it uses less digits than its factorization.

641387056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13716 (or 13710 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 40.

The square root of 641387056 is about 25325.6205452107. The cubic root of 641387056 is about 862.3959937879.

The spelling of 641387056 in words is "six hundred forty-one million, three hundred eighty-seven thousand, fifty-six".