6685638 has 8 divisors (see below), whose sum is σ = 13371288. Its totient is φ = 2228544.

The previous prime is 6685633. The next prime is 6685643. The reversal of 6685638 is 8365866.

It is an interprime number because it is at equal distance from previous prime (6685633) and next prime (6685643).

It is a sphenic number, since it is the product of 3 distinct primes.

6685638 is an admirable number.

It is a d-powerful number, because it can be written as 6³ + 6⁷ + 8⁷ + 5³ + 6⁸ + 3¹² + 8⁷ .

It is a self number, because there is not a number n which added to its sum of digits gives 6685638.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6685633) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 557131 + ... + 557142.

It is an arithmetic number, because the mean of its divisors is an integer number (1671411).

Almost surely, 2^6685638 is an apocalyptic number.

6685638 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

6685638 is a wasteful number, since it uses less digits than its factorization.

6685638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1114278.

The product of its digits is 207360, while the sum is 42.

The square root of 6685638 is about 2585.6600704656. The cubic root of 6685638 is about 188.3855637804.

The spelling of 6685638 in words is "six million, six hundred eighty-five thousand, six hundred thirty-eight".