6663636 has 72 divisors (see below), whose sum is σ = 19894784. Its totient is φ = 1840320.

The previous prime is 6663617. The next prime is 6663647. The reversal of 6663636 is 6363666.

It is a Harshad number since it is a multiple of its sum of digits (36).

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

It is a self number, because there is not a number n which added to its sum of digits gives 6663636.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7386 + ... + 8238.

Almost surely, 2^6663636 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6663636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9947392).

6663636 is an abundant number, since it is smaller than the sum of its proper divisors (13231148).

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

6663636 is a wasteful number, since it uses less digits than its factorization.

6663636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 901 (or 896 counting only the distinct ones).

The product of its digits is 69984, while the sum is 36.

The square root of 6663636 is about 2581.4019446804. The cubic root of 6663636 is about 188.1786817882.

The spelling of 6663636 in words is "six million, six hundred sixty-three thousand, six hundred thirty-six".