646682288428 has 24 divisors (see below), whose sum is σ = 1288252465920. Its totient is φ = 281166211920.

The previous prime is 646682288401. The next prime is 646682288429. The reversal of 646682288428 is 824882286646.

It is a super-2 number, since 2×646682288428² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 646682288428.

It is not an unprimeable number, because it can be changed into a prime (646682288429) 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, 319506048 + ... + 319508071.

It is an arithmetic number, because the mean of its divisors is an integer number (53677186080).

Almost surely, 2^646682288428 is an apocalyptic number.

It is an amenable number.

646682288428 is a deficient number, since it is larger than the sum of its proper divisors (641570177492).

646682288428 is a wasteful number, since it uses less digits than its factorization.

646682288428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 639014157 (or 639014155 counting only the distinct ones).

The product of its digits is 113246208, while the sum is 64.

The spelling of 646682288428 in words is "six hundred forty-six billion, six hundred eighty-two million, two hundred eighty-eight thousand, four hundred twenty-eight".