6378636 has 72 divisors (see below), whose sum is σ = 17160192. Its totient is φ = 1839200.

The previous prime is 6378629. The next prime is 6378703. The reversal of 6378636 is 6368736.

It is a happy number.

Its product of digits (108864) is a multiple of the sum of its prime factors (243).

It is a junction number, because it is equal to n+sod(n) for n = 6378594 and 6378603.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33301 + ... + 33491.

It is an arithmetic number, because the mean of its divisors is an integer number (238336).

Almost surely, 2^6378636 is an apocalyptic number.

6378636 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6378636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8580096).

6378636 is an abundant number, since it is smaller than the sum of its proper divisors (10781556).

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

6378636 is a wasteful number, since it uses less digits than its factorization.

6378636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243 (or 230 counting only the distinct ones).

The product of its digits is 108864, while the sum is 39.

The square root of 6378636 is about 2525.5961672445. The cubic root of 6378636 is about 185.4567336605.

The spelling of 6378636 in words is "six million, three hundred seventy-eight thousand, six hundred thirty-six".