6663870 has 80 divisors (see below), whose sum is σ = 18905040. Its totient is φ = 1679616.

The previous prime is 6663869. The next prime is 6663893. The reversal of 6663870 is 783666.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 15174 + ... + 15606.

It is an arithmetic number, because the mean of its divisors is an integer number (236313).

Almost surely, 2^6663870 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6663870, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9452520).

6663870 is an abundant number, since it is smaller than the sum of its proper divisors (12241170).

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

6663870 is a wasteful number, since it uses less digits than its factorization.

6663870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 471 (or 462 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The square root of 6663870 is about 2581.4472684911. The cubic root of 6663870 is about 188.1808844543.

It can be divided in two parts, 66 and 63870, that added together give a palindrome (63936).

The spelling of 6663870 in words is "six million, six hundred sixty-three thousand, eight hundred seventy".