16664087 has 4 divisors (see below), whose sum is σ = 18179016. Its totient is φ = 15149160.

The previous prime is 16664059. The next prime is 16664107. The reversal of 16664087 is 78046661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16664087 - 2⁸ = 16663831 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16664087.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16664017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 757448 + ... + 757469.

It is an arithmetic number, because the mean of its divisors is an integer number (4544754).

Almost surely, 2^16664087 is an apocalyptic number.

16664087 is a deficient number, since it is larger than the sum of its proper divisors (1514929).

16664087 is a wasteful number, since it uses less digits than its factorization.

16664087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1514928.

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 16664087 is about 4082.1669490603. The cubic root of 16664087 is about 255.4232979652.

The spelling of 16664087 in words is "sixteen million, six hundred sixty-four thousand, eighty-seven".