28803138 has 64 divisors (see below), whose sum is σ = 71995392. Its totient is φ = 7479360.

The previous prime is 28803133. The next prime is 28803149. The reversal of 28803138 is 83130882.

It is a junction number, because it is equal to n+sod(n) for n = 28803099 and 28803108.

It is not an unprimeable number, because it can be changed into a prime (28803133) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 38395 + ... + 39137.

It is an arithmetic number, because the mean of its divisors is an integer number (1124928).

Almost surely, 2^28803138 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28803138, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35997696).

28803138 is an abundant number, since it is smaller than the sum of its proper divisors (43192254).

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

28803138 is a wasteful number, since it uses less digits than its factorization.

28803138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 839.

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 28803138 is about 5366.8555039241. The cubic root of 28803138 is about 306.5349053263.

The spelling of 28803138 in words is "twenty-eight million, eight hundred three thousand, one hundred thirty-eight".