18487616 has 56 divisors (see below), whose sum is σ = 43403520. Its totient is φ = 7644672.

The previous prime is 18487603. The next prime is 18487621. The reversal of 18487616 is 61678481.

It is a tau number, because it is divible by the number of its divisors (56).

It is a congruent number.

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, 12281 + ... + 13703.

Almost surely, 2^18487616 is an apocalyptic number.

18487616 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 18487616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21701760).

18487616 is an abundant number, since it is smaller than the sum of its proper divisors (24915904).

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

18487616 is a wasteful number, since it uses less digits than its factorization.

18487616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1471 (or 1461 counting only the distinct ones).

The product of its digits is 64512, while the sum is 41.

The square root of 18487616 is about 4299.7227817616. The cubic root of 18487616 is about 264.4195959882.

The spelling of 18487616 in words is "eighteen million, four hundred eighty-seven thousand, six hundred sixteen".