6564646928 has 40 divisors (see below), whose sum is σ = 14620070208.
Its totient is φ = 2797149312.
The previous prime is 6564646909. The next prime is 6564646937. The reversal of 6564646928 is 8296464656.
It is a Harshad number since it is a multiple of its sum of digits (56).
It is a fibodiv number, since the Fibonacci-like sequence with seeds 65646 and 46928 contains 6564646928 itself.
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, 150026 + ... + 188777.
Almost surely, 26564646928 is an apocalyptic number.
It is an amenable number.
6564646928 is an abundant number, since it is smaller than the sum of its proper divisors (8055423280).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
6564646928 is a wasteful number, since it uses less digits than its factorization.
6564646928 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 338991 (or 338985 counting only the distinct ones).
The product of its digits is 14929920, while the sum is 56.
The square root of 6564646928 is about 81022.5087737969.
The cubic root of 6564646928 is about 1872.4222405102.
The spelling of 6564646928 in words is "six billion, five hundred sixty-four million, six hundred forty-six thousand, nine hundred twenty-eight".