7866564 has 12 divisors (see below), whose sum is σ = 18355344. Its totient is φ = 2622184.

The previous prime is 7866559. The next prime is 7866571. The reversal of 7866564 is 4656687.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 327762 + ... + 327785.

It is an arithmetic number, because the mean of its divisors is an integer number (1529612).

Almost surely, 2^7866564 is an apocalyptic number.

It is an amenable number.

7866564 is an abundant number, since it is smaller than the sum of its proper divisors (10488780).

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

7866564 is a wasteful number, since it uses less digits than its factorization.

7866564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 655554 (or 655552 counting only the distinct ones).

The product of its digits is 241920, while the sum is 42.

The square root of 7866564 is about 2804.7395601018. The cubic root of 7866564 is about 198.8817930510.

The spelling of 7866564 in words is "seven million, eight hundred sixty-six thousand, five hundred sixty-four".