18878616 has 64 divisors (see below), whose sum is σ = 53222400. Its totient is φ = 6199200.

The previous prime is 18878581. The next prime is 18878627. The reversal of 18878616 is 61687881.

It is a congruent number.

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, 14721 + ... + 15951.

It is an arithmetic number, because the mean of its divisors is an integer number (831600).

Almost surely, 2^18878616 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 18878616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26611200).

18878616 is an abundant number, since it is smaller than the sum of its proper divisors (34343784).

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

18878616 is a wasteful number, since it uses less digits than its factorization.

18878616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1317 (or 1307 counting only the distinct ones).

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

The square root of 18878616 is about 4344.9529341525. The cubic root of 18878616 is about 266.2707026156.

The spelling of 18878616 in words is "eighteen million, eight hundred seventy-eight thousand, six hundred sixteen".