6428618564 has 24 divisors (see below), whose sum is σ = 11429825400. Its totient is φ = 3163152384.

The previous prime is 6428618563. The next prime is 6428618569. The reversal of 6428618564 is 4658168246.

It can be written as a sum of positive squares in 4 ways, for example, as 631014400 + 5797604164 = 25120^2 + 76142^2 .

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (6428618563) 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, 106592 + ... + 155624.

It is an arithmetic number, because the mean of its divisors is an integer number (476242725).

Almost surely, 2^6428618564 is an apocalyptic number.

It is an amenable number.

6428618564 is a deficient number, since it is larger than the sum of its proper divisors (5001206836).

6428618564 is a wasteful number, since it uses less digits than its factorization.

6428618564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49559 (or 49557 counting only the distinct ones).

The product of its digits is 2211840, while the sum is 50.

The square root of 6428618564 is about 80178.6665142293. Note that the first 3 decimals coincide. The cubic root of 6428618564 is about 1859.3988271820.

The spelling of 6428618564 in words is "six billion, four hundred twenty-eight million, six hundred eighteen thousand, five hundred sixty-four".