18808564 has 6 divisors (see below), whose sum is σ = 32914994. Its totient is φ = 9404280.

The previous prime is 18808541. The next prime is 18808571. The reversal of 18808564 is 46580881.

It can be written as a sum of positive squares in only one way, i.e., 12306064 + 6502500 = 3508^2 + 2550^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2351067 + ... + 2351074.

Almost surely, 2^18808564 is an apocalyptic number.

It is an amenable number.

18808564 is a deficient number, since it is larger than the sum of its proper divisors (14106430).

18808564 is a wasteful number, since it uses less digits than its factorization.

18808564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4702145 (or 4702143 counting only the distinct ones).

The product of its (nonzero) digits is 61440, while the sum is 40.

The square root of 18808564 is about 4336.8841349522. The cubic root of 18808564 is about 265.9409483177.

The spelling of 18808564 in words is "eighteen million, eight hundred eight thousand, five hundred sixty-four".