28671638 has 8 divisors (see below), whose sum is σ = 43097232. Its totient is φ = 14305896.

The previous prime is 28671637. The next prime is 28671653. The reversal of 28671638 is 83617682.

It is a happy number.

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 28671595 and 28671604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28671631) 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, 13745 + ... + 15692.

It is an arithmetic number, because the mean of its divisors is an integer number (5387154).

Almost surely, 2^28671638 is an apocalyptic number.

28671638 is a deficient number, since it is larger than the sum of its proper divisors (14425594).

28671638 is a wasteful number, since it uses less digits than its factorization.

28671638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29926.

The product of its digits is 96768, while the sum is 41.

The square root of 28671638 is about 5354.5903671523. The cubic root of 28671638 is about 306.0677011409.

The spelling of 28671638 in words is "twenty-eight million, six hundred seventy-one thousand, six hundred thirty-eight".