6564994 has 16 divisors (see below), whose sum is σ = 10702080. Its totient is φ = 3008880.

The previous prime is 6564983. The next prime is 6564997. The reversal of 6564994 is 4994656.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 6564994.

It is not an unprimeable number, because it can be changed into a prime (6564997) 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, 1609 + ... + 3964.

It is an arithmetic number, because the mean of its divisors is an integer number (668880).

Almost surely, 2^6564994 is an apocalyptic number.

6564994 is a deficient number, since it is larger than the sum of its proper divisors (4137086).

6564994 is a wasteful number, since it uses less digits than its factorization.

6564994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5625.

The product of its digits is 233280, while the sum is 43.

The square root of 6564994 is about 2562.2244242064. The cubic root of 6564994 is about 187.2455238166.

The spelling of 6564994 in words is "six million, five hundred sixty-four thousand, nine hundred ninety-four".