640108801 has 8 divisors (see below), whose sum is σ = 663895808. Its totient is φ = 616518000.

The previous prime is 640108787. The next prime is 640108813. The reversal of 640108801 is 108801046.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-640108801 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 640108801.

It is not an unprimeable number, because it can be changed into a prime (640108831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42390 + ... + 55471.

It is an arithmetic number, because the mean of its divisors is an integer number (82986976).

Almost surely, 2^640108801 is an apocalyptic number.

It is an amenable number.

640108801 is a deficient number, since it is larger than the sum of its proper divisors (23787007).

640108801 is a wasteful number, since it uses less digits than its factorization.

640108801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98103.

The product of its (nonzero) digits is 1536, while the sum is 28.

The square root of 640108801 is about 25300.3715585364. The cubic root of 640108801 is about 861.8227075475.

Adding to 640108801 its reverse (108801046), we get a palindrome (748909847).

The spelling of 640108801 in words is "six hundred forty million, one hundred eight thousand, eight hundred one".