6904638 has 48 divisors (see below), whose sum is σ = 16969680. Its totient is φ = 2011392.

The previous prime is 6904637. The next prime is 6904643. The reversal of 6904638 is 8364096.

It is a super-2 number, since 2×6904638² = 95348051822088, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6904631) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3670 + ... + 5222.

It is an arithmetic number, because the mean of its divisors is an integer number (353535).

Almost surely, 2^6904638 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6904638, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8484840).

6904638 is an abundant number, since it is smaller than the sum of its proper divisors (10065042).

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

6904638 is a wasteful number, since it uses less digits than its factorization.

6904638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1593 (or 1590 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 6904638 is about 2627.6677872212. The cubic root of 6904638 is about 190.4204723120.

The spelling of 6904638 in words is "six million, nine hundred four thousand, six hundred thirty-eight".