7878564 has 18 divisors (see below), whose sum is σ = 19915350. Its totient is φ = 2626176.

The previous prime is 7878553. The next prime is 7878569. The reversal of 7878564 is 4658787.

7878564 is a `hidden beast` number, since 7 + 87 + 8 + 564 = 666.

7878564 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 7518564 + 360000 = 2742^2 + 600^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (7878569) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 109389 + ... + 109460.

Almost surely, 2^7878564 is an apocalyptic number.

It is an amenable number.

7878564 is an abundant number, since it is smaller than the sum of its proper divisors (12036786).

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

7878564 is a wasteful number, since it uses less digits than its factorization.

7878564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218859 (or 218854 counting only the distinct ones).

The product of its digits is 376320, while the sum is 45.

The square root of 7878564 is about 2806.8779809603. The cubic root of 7878564 is about 198.9828693283.

The spelling of 7878564 in words is "seven million, eight hundred seventy-eight thousand, five hundred sixty-four".