28875798 has 64 divisors (see below), whose sum is σ = 74880000. Its totient is φ = 8244936.

The previous prime is 28875779. The next prime is 28875827. The reversal of 28875798 is 89757882.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17743 + ... + 19301.

It is an arithmetic number, because the mean of its divisors is an integer number (1170000).

Almost surely, 2^28875798 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28875798, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37440000).

28875798 is an abundant number, since it is smaller than the sum of its proper divisors (46004202).

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

28875798 is a wasteful number, since it uses less digits than its factorization.

28875798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1591 (or 1571 counting only the distinct ones).

The product of its digits is 2257920, while the sum is 54.

The square root of 28875798 is about 5373.6205671781. The cubic root of 28875798 is about 306.7924481402.

It can be divided in two parts, 28 and 875798, that added together give a triangular number (875826 = T₁₃₂₃).

The spelling of 28875798 in words is "twenty-eight million, eight hundred seventy-five thousand, seven hundred ninety-eight".