15664006 has 4 divisors (see below), whose sum is σ = 23496012. Its totient is φ = 7832002.

The previous prime is 15664003. The next prime is 15664013. The reversal of 15664006 is 60046651.

15664006 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60046651 = 7 ⋅8578093.

It is a super-2 number, since 2×15664006² = 490722167936072, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15664003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3916000 + ... + 3916003.

It is an arithmetic number, because the mean of its divisors is an integer number (5874003).

Almost surely, 2^15664006 is an apocalyptic number.

15664006 is a deficient number, since it is larger than the sum of its proper divisors (7832006).

15664006 is an equidigital number, since it uses as much as digits as its factorization.

15664006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7832005.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 15664006 is about 3957.7779119097. Note that the first 3 decimals coincide. The cubic root of 15664006 is about 250.2078591304.

The spelling of 15664006 in words is "fifteen million, six hundred sixty-four thousand, six".