12664806 has 64 divisors (see below), whose sum is σ = 32071680. Its totient is φ = 3238560.

The previous prime is 12664781. The next prime is 12664807. The reversal of 12664806 is 60846621.

It is a happy number.

It is a super-2 number, since 2×12664806² = 320794622035272, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12664807) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 36325 + ... + 36671.

It is an arithmetic number, because the mean of its divisors is an integer number (501120).

Almost surely, 2^12664806 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12664806, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16035840).

12664806 is an abundant number, since it is smaller than the sum of its proper divisors (19406874).

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

12664806 is a wasteful number, since it uses less digits than its factorization.

12664806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 449.

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 12664806 is about 3558.7646733101. The cubic root of 12664806 is about 233.0949406482.

The spelling of 12664806 in words is "twelve million, six hundred sixty-four thousand, eight hundred six".