28638038 has 24 divisors (see below), whose sum is σ = 50854944. Its totient is φ = 12014640.

The previous prime is 28638019. The next prime is 28638061. The reversal of 28638038 is 83083682.

It is a junction number, because it is equal to n+sod(n) for n = 28637992 and 28638010.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1406 + ... + 7697.

It is an arithmetic number, because the mean of its divisors is an integer number (2118956).

Almost surely, 2^28638038 is an apocalyptic number.

28638038 is a deficient number, since it is larger than the sum of its proper divisors (22216906).

28638038 is a wasteful number, since it uses less digits than its factorization.

28638038 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9140 (or 9129 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 38.

The square root of 28638038 is about 5351.4519525078. The cubic root of 28638038 is about 305.9480952018.

It can be divided in two parts, 2863 and 8038, that added together give a palindrome (10901).

The spelling of 28638038 in words is "twenty-eight million, six hundred thirty-eight thousand, thirty-eight".