646820000140 has 24 divisors (see below), whose sum is σ = 1358337123360. Its totient is φ = 258725119488.

The previous prime is 646820000027. The next prime is 646820000147. The reversal of 646820000140 is 41000028646.

It is a super-2 number, since 2×646820000140² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (646820000147) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3336801 + ... + 3525319.

It is an arithmetic number, because the mean of its divisors is an integer number (56597380140).

Almost surely, 2^646820000140 is an apocalyptic number.

It is an amenable number.

646820000140 is an abundant number, since it is smaller than the sum of its proper divisors (711517123220).

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

646820000140 is a wasteful number, since it uses less digits than its factorization.

646820000140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360081 (or 360079 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 31.

Adding to 646820000140 its reverse (41000028646), we get a palindrome (687820028786).

The spelling of 646820000140 in words is "six hundred forty-six billion, eight hundred twenty million, one hundred forty", and thus it is an aban number.