16681587 has 8 divisors (see below), whose sum is σ = 23953104. Its totient is φ = 10265568.

The previous prime is 16681579. The next prime is 16681597. The reversal of 16681587 is 78518661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 16681587 - 2³ = 16681579 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16681507) 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, 213828 + ... + 213905.

It is an arithmetic number, because the mean of its divisors is an integer number (2994138).

Almost surely, 2^16681587 is an apocalyptic number.

16681587 is a deficient number, since it is larger than the sum of its proper divisors (7271517).

16681587 is a wasteful number, since it uses less digits than its factorization.

16681587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427749.

The product of its digits is 80640, while the sum is 42.

The square root of 16681587 is about 4084.3098560222. The cubic root of 16681587 is about 255.5126786779.

The spelling of 16681587 in words is "sixteen million, six hundred eighty-one thousand, five hundred eighty-seven".