18061648 has 40 divisors (see below), whose sum is σ = 39122496. Its totient is φ = 8006400.

The previous prime is 18061643. The next prime is 18061651. The reversal of 18061648 is 84616081.

18061648 is nontrivially palindromic in base 7.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18061643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5965 + ... + 8467.

Almost surely, 2^18061648 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 18061648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19561248).

18061648 is an abundant number, since it is smaller than the sum of its proper divisors (21060848).

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

18061648 is a wasteful number, since it uses less digits than its factorization.

18061648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2563 (or 2557 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 34.

The square root of 18061648 is about 4249.8997635238. The cubic root of 18061648 is about 262.3729901060.

The spelling of 18061648 in words is "eighteen million, sixty-one thousand, six hundred forty-eight".