646448864428 has 24 divisors (see below), whose sum is σ = 1139237713152. Its totient is φ = 320956382544.

The previous prime is 646448864419. The next prime is 646448864513. The reversal of 646448864428 is 824468844646.

646448864428 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×646448864428² (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 646448864428.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 145575 + ... + 1146337.

It is an arithmetic number, because the mean of its divisors is an integer number (47468238048).

Almost surely, 2^646448864428 is an apocalyptic number.

It is an amenable number.

646448864428 is a deficient number, since it is larger than the sum of its proper divisors (492788848724).

646448864428 is a wasteful number, since it uses less digits than its factorization.

646448864428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1001901 (or 1001899 counting only the distinct ones).

The product of its digits is 226492416, while the sum is 64.

The spelling of 646448864428 in words is "six hundred forty-six billion, four hundred forty-eight million, eight hundred sixty-four thousand, four hundred twenty-eight".