640028820008 has 16 divisors (see below), whose sum is σ = 1238765458560. Its totient is φ = 309691364400.

The previous prime is 640028819971. The next prime is 640028820047. The reversal of 640028820008 is 800028820046.

It is a super-2 number, since 2×640028820008² (a number of 24 digits) 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 3 ways as a sum of consecutive naturals, for example, 1290380438 + ... + 1290380933.

It is an arithmetic number, because the mean of its divisors is an integer number (77422841160).

Almost surely, 2^640028820008 is an apocalyptic number.

It is an amenable number.

640028820008 is a deficient number, since it is larger than the sum of its proper divisors (598736638552).

640028820008 is a wasteful number, since it uses less digits than its factorization.

640028820008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2580761408 (or 2580761404 counting only the distinct ones).

The product of its (nonzero) digits is 49152, while the sum is 38.

Adding to 640028820008 its sum of digits (38), we get a palindrome (640028820046).

The spelling of 640028820008 in words is "six hundred forty billion, twenty-eight million, eight hundred twenty thousand, eight".