28428825 has 24 divisors (see below), whose sum is σ = 47541600. Its totient is φ = 14988160.

The previous prime is 28428793. The next prime is 28428847. The reversal of 28428825 is 52882482.

It is not a de Polignac number, because 28428825 - 2⁵ = 28428793 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4546 + ... + 8804.

It is an arithmetic number, because the mean of its divisors is an integer number (1980900).

Almost surely, 2^28428825 is an apocalyptic number.

28428825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28428825 is a deficient number, since it is larger than the sum of its proper divisors (19112775).

28428825 is a wasteful number, since it uses less digits than its factorization.

28428825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4361 (or 4356 counting only the distinct ones).

The product of its digits is 81920, while the sum is 39.

The square root of 28428825 is about 5331.8688093388. The cubic root of 28428825 is about 305.2012467406.

The spelling of 28428825 in words is "twenty-eight million, four hundred twenty-eight thousand, eight hundred twenty-five".