18687648 has 48 divisors (see below), whose sum is σ = 56064960. Its totient is φ = 5339136.

The previous prime is 18687587. The next prime is 18687731. The reversal of 18687648 is 84678681.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 18687597 and 18687606.

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, 13233 + ... + 14576.

It is an arithmetic number, because the mean of its divisors is an integer number (1168020).

Almost surely, 2^18687648 is an apocalyptic number.

It is an amenable number.

18687648 is an abundant number, since it is smaller than the sum of its proper divisors (37377312).

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

18687648 is a wasteful number, since it uses less digits than its factorization.

18687648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27829 (or 27821 counting only the distinct ones).

The product of its digits is 516096, while the sum is 48.

The square root of 18687648 is about 4322.9212345357. The cubic root of 18687648 is about 265.3698313190.

The spelling of 18687648 in words is "eighteen million, six hundred eighty-seven thousand, six hundred forty-eight".