640216452 has 24 divisors (see below), whose sum is σ = 1496340832. Its totient is φ = 213048000.

The previous prime is 640216403. The next prime is 640216459. The reversal of 640216452 is 254612046.

It is a super-2 number, since 2×640216452² = 819754210822936608, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (640216459) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 37174 + ... + 51597.

Almost surely, 2^640216452 is an apocalyptic number.

It is an amenable number.

640216452 is an abundant number, since it is smaller than the sum of its proper divisors (856124380).

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

640216452 is a wasteful number, since it uses less digits than its factorization.

640216452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89379 (or 89377 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 640216452 is about 25302.4989279715. The cubic root of 640216452 is about 861.8710174993.

Adding to 640216452 its reverse (254612046), we get a palindrome (894828498).

The spelling of 640216452 in words is "six hundred forty million, two hundred sixteen thousand, four hundred fifty-two".