18636716 has 48 divisors (see below), whose sum is σ = 39857664. Its totient is φ = 7451136.

The previous prime is 18636679. The next prime is 18636727. The reversal of 18636716 is 61763681.

It is a self number, because there is not a number n which added to its sum of digits gives 18636716.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27356 + ... + 28028.

It is an arithmetic number, because the mean of its divisors is an integer number (830368).

Almost surely, 2^18636716 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18636716, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19928832).

18636716 is an abundant number, since it is smaller than the sum of its proper divisors (21220948).

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

18636716 is a wasteful number, since it uses less digits than its factorization.

18636716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 750 (or 748 counting only the distinct ones).

The product of its digits is 36288, while the sum is 38.

The square root of 18636716 is about 4317.0262913260. The cubic root of 18636716 is about 265.1285290836.

The spelling of 18636716 in words is "eighteen million, six hundred thirty-six thousand, seven hundred sixteen".