18047616 has 64 divisors (see below), whose sum is σ = 49098720. Its totient is φ = 5870592.

The previous prime is 18047593. The next prime is 18047647. The reversal of 18047616 is 61674081.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (64).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15966 + ... + 17058.

Almost surely, 2^18047616 is an apocalyptic number.

18047616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18047616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24549360).

18047616 is an abundant number, since it is smaller than the sum of its proper divisors (31051104).

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

18047616 is a wasteful number, since it uses less digits than its factorization.

18047616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1153 (or 1141 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 18047616 is about 4248.2485802975. The cubic root of 18047616 is about 262.3050271011.

The spelling of 18047616 in words is "eighteen million, forty-seven thousand, six hundred sixteen".