6440200002 has 20 divisors (see below), whose sum is σ = 14430818886. Its totient is φ = 2146733280.

The previous prime is 6440199991. The next prime is 6440200021. The reversal of 6440200002 is 2000020446.

6440200002 is a `hidden beast` number, since 644 + 0 + 20 + 0 + 0 + 0 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 3256870761 + 3183329241 = 57069^2 + 56421^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 19876999 + ... + 19877322.

Almost surely, 2^6440200002 is an apocalyptic number.

6440200002 is an abundant number, since it is smaller than the sum of its proper divisors (7990618884).

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

6440200002 is a wasteful number, since it uses less digits than its factorization.

6440200002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39754335 (or 39754326 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 6440200002 is about 80250.8567057075. The cubic root of 6440200002 is about 1860.5147534710.

Adding to 6440200002 its reverse (2000020446), we get a palindrome (8440220448).

The spelling of 6440200002 in words is "six billion, four hundred forty million, two hundred thousand, two".