28875820 has 24 divisors (see below), whose sum is σ = 63831600. Its totient is φ = 10942272.

The previous prime is 28875779. The next prime is 28875827. The reversal of 28875820 is 2857882.

It is not an unprimeable number, because it can be changed into a prime (28875827) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37615 + ... + 38374.

It is an arithmetic number, because the mean of its divisors is an integer number (2659650).

Almost surely, 2^28875820 is an apocalyptic number.

28875820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28875820 is an abundant number, since it is smaller than the sum of its proper divisors (34955780).

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

28875820 is a wasteful number, since it uses less digits than its factorization.

28875820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76017 (or 76015 counting only the distinct ones).

The product of its (nonzero) digits is 71680, while the sum is 40.

The square root of 28875820 is about 5373.6226142147. The cubic root of 28875820 is about 306.7925260536.

The spelling of 28875820 in words is "twenty-eight million, eight hundred seventy-five thousand, eight hundred twenty".