640211108 has 12 divisors (see below), whose sum is σ = 1126175820. Its totient is φ = 318446592.

The previous prime is 640211093. The next prime is 640211113. The reversal of 640211108 is 801112046.

It can be written as a sum of positive squares in 2 ways, for example, as 53699584 + 586511524 = 7328^2 + 24218^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 413873 + ... + 415416.

It is an arithmetic number, because the mean of its divisors is an integer number (93847985).

Almost surely, 2^640211108 is an apocalyptic number.

It is an amenable number.

640211108 is a deficient number, since it is larger than the sum of its proper divisors (485964712).

640211108 is a wasteful number, since it uses less digits than its factorization.

640211108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 829486 (or 829484 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 640211108 is about 25302.3933255335. The cubic root of 640211108 is about 861.8686194293.

The spelling of 640211108 in words is "six hundred forty million, two hundred eleven thousand, one hundred eight".