28894638 has 8 divisors (see below), whose sum is σ = 57789288. Its totient is φ = 9631544.

The previous prime is 28894637. The next prime is 28894639. The reversal of 28894638 is 83649882.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28894637) and next prime (28894639).

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

28894638 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28894631) 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, 2407881 + ... + 2407892.

It is an arithmetic number, because the mean of its divisors is an integer number (7223661).

Almost surely, 2^28894638 is an apocalyptic number.

28894638 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.

28894638 is a wasteful number, since it uses less digits than its factorization.

28894638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4815778.

The product of its digits is 663552, while the sum is 48.

The square root of 28894638 is about 5375.3732893633. The cubic root of 28894638 is about 306.8591558278.

The spelling of 28894638 in words is "twenty-eight million, eight hundred ninety-four thousand, six hundred thirty-eight".