18987648 has 64 divisors (see below), whose sum is σ = 50893920. Its totient is φ = 6272000.

The previous prime is 18987641. The next prime is 18987649. The reversal of 18987648 is 84678981.

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

It is a self number, because there is not a number n which added to its sum of digits gives 18987648.

It is not an unprimeable number, because it can be changed into a prime (18987641) 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, 75523 + ... + 75773.

Almost surely, 2^18987648 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 18987648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25446960).

18987648 is an abundant number, since it is smaller than the sum of its proper divisors (31906272).

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

18987648 is a wasteful number, since it uses less digits than its factorization.

18987648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 465 (or 453 counting only the distinct ones).

The product of its digits is 774144, while the sum is 51.

The square root of 18987648 is about 4357.4818416145. The cubic root of 18987648 is about 266.7823276051.

The spelling of 18987648 in words is "eighteen million, nine hundred eighty-seven thousand, six hundred forty-eight".