18057636 has 18 divisors (see below), whose sum is σ = 45645782. Its totient is φ = 6019200.

The previous prime is 18057631. The next prime is 18057661. The reversal of 18057636 is 63675081.

18057636 is a `hidden beast` number, since 1 + 80 + 576 + 3 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 14017536 + 4040100 = 3744^2 + 2010^2 .

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

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 501601 = 18057636 / (1 + 8 + 0 + 5 + 7 + 6 + 3 + 6).

It is a self number, because there is not a number n which added to its sum of digits gives 18057636.

It is not an unprimeable number, because it can be changed into a prime (18057631) 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, 250765 + ... + 250836.

Almost surely, 2^18057636 is an apocalyptic number.

It is an amenable number.

18057636 is an abundant number, since it is smaller than the sum of its proper divisors (27588146).

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

18057636 is a wasteful number, since it uses less digits than its factorization.

18057636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 501611 (or 501606 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 18057636 is about 4249.4277261768. The cubic root of 18057636 is about 262.3535618607.

The spelling of 18057636 in words is "eighteen million, fifty-seven thousand, six hundred thirty-six".