18887616 has 126 divisors (see below), whose sum is σ = 59726576. Its totient is φ = 5702400.

The previous prime is 18887597. The next prime is 18887639. The reversal of 18887616 is 61678881.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 69561 + ... + 69831.

Almost surely, 2^18887616 is an apocalyptic number.

18887616 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 18887616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29863288).

18887616 is an abundant number, since it is smaller than the sum of its proper divisors (40838960).

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

18887616 is a wasteful number, since it uses less digits than its factorization.

18887616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311 (or 287 counting only the distinct ones).

The product of its digits is 129024, while the sum is 45.

The square root of 18887616 is about 4345.9884951527. The cubic root of 18887616 is about 266.3130089585.

It can be divided in two parts, 18887 and 616, that added together give a triangular number (19503 = T₁₉₇).

The spelling of 18887616 in words is "eighteen million, eight hundred eighty-seven thousand, six hundred sixteen".