6564978 has 24 divisors (see below), whose sum is σ = 16256448. Its totient is φ = 1875672.

The previous prime is 6564977. The next prime is 6564983. The reversal of 6564978 is 8794656.

It is a super-2 number, since 2×6564978² = 86197872280968, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6564973) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25926 + ... + 26177.

It is an arithmetic number, because the mean of its divisors is an integer number (677352).

Almost surely, 2^6564978 is an apocalyptic number.

6564978 is an abundant number, since it is smaller than the sum of its proper divisors (9691470).

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

6564978 is a wasteful number, since it uses less digits than its factorization.

6564978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52118 (or 52115 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 6564978 is about 2562.2213019175. The cubic root of 6564978 is about 187.2453717002.

The spelling of 6564978 in words is "six million, five hundred sixty-four thousand, nine hundred seventy-eight".