42564609 has 24 divisors (see below), whose sum is σ = 64384320. Its totient is φ = 28098576.

The previous prime is 42564607. The next prime is 42564611. The reversal of 42564609 is 90646524.

42564609 is a `hidden beast` number, since 4 + 2 + 5 + 646 + 0 + 9 = 666.

It is an interprime number because it is at equal distance from previous prime (42564607) and next prime (42564611).

It is not a de Polignac number, because 42564609 - 2¹ = 42564607 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42564607) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25684 + ... + 27290.

It is an arithmetic number, because the mean of its divisors is an integer number (2682680).

Almost surely, 2^42564609 is an apocalyptic number.

It is an amenable number.

42564609 is a deficient number, since it is larger than the sum of its proper divisors (21819711).

42564609 is a wasteful number, since it uses less digits than its factorization.

42564609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1731 (or 1719 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 42564609 is about 6524.1558074589. The cubic root of 42564609 is about 349.1533522554.

The spelling of 42564609 in words is "forty-two million, five hundred sixty-four thousand, six hundred nine".