6415668 has 54 divisors (see below), whose sum is σ = 18870306. Its totient is φ = 1832544.

The previous prime is 6415657. The next prime is 6415679. The reversal of 6415668 is 8665146.

6415668 is a `hidden beast` number, since 641 + 5 + 6 + 6 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (6415657) and next prime (6415679).

It can be written as a sum of positive squares in only one way, i.e., 3732624 + 2683044 = 1932^2 + 1638^2 .

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 55 + ... + 3582.

Almost surely, 2^6415668 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 6415668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9435153).

6415668 is an abundant number, since it is smaller than the sum of its proper divisors (12454638).

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

6415668 is a wasteful number, since it uses less digits than its factorization.

6415668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3661 (or 3649 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 6415668 is about 2532.9168955969. The cubic root of 6415668 is about 185.8149390701.

The spelling of 6415668 in words is "six million, four hundred fifteen thousand, six hundred sixty-eight".