3217422640 has 20 divisors (see below), whose sum is σ = 7480507824. Its totient is φ = 1286969024.

The previous prime is 3217422617. The next prime is 3217422679. The reversal of 3217422640 is 462247123.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20108812 + ... + 20108971.

Almost surely, 2^3217422640 is an apocalyptic number.

It is an amenable number.

3217422640 is an abundant number, since it is smaller than the sum of its proper divisors (4263085184).

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

3217422640 is a wasteful number, since it uses less digits than its factorization.

3217422640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40217796 (or 40217790 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 31.

The square root of 3217422640 is about 56722.3292892667. The cubic root of 3217422640 is about 1476.2821585368.

Adding to 3217422640 its reverse (462247123), we get a palindrome (3679669763).

The spelling of 3217422640 in words is "three billion, two hundred seventeen million, four hundred twenty-two thousand, six hundred forty".