28103888 has 40 divisors (see below), whose sum is σ = 57734400. Its totient is φ = 13215744.

The previous prime is 28103879. The next prime is 28103893. The reversal of 28103888 is 88830182.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58433 + ... + 58911.

It is an arithmetic number, because the mean of its divisors is an integer number (1443360).

Almost surely, 2^28103888 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28103888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28867200).

28103888 is an abundant number, since it is smaller than the sum of its proper divisors (29630512).

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

28103888 is a wasteful number, since it uses less digits than its factorization.

28103888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 699 (or 693 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 38.

The square root of 28103888 is about 5301.3100267764. The cubic root of 28103888 is about 304.0339874281.

The spelling of 28103888 in words is "twenty-eight million, one hundred three thousand, eight hundred eighty-eight".