28347825 has 24 divisors (see below), whose sum is σ = 51130656. Its totient is φ = 13744000.

The previous prime is 28347811. The next prime is 28347841. The reversal of 28347825 is 52874382.

It is not a de Polignac number, because 28347825 - 2¹² = 28343729 is a prime.

It is a Curzon number.

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, 16356 + ... + 18005.

It is an arithmetic number, because the mean of its divisors is an integer number (2130444).

Almost surely, 2^28347825 is an apocalyptic number.

28347825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28347825 is a deficient number, since it is larger than the sum of its proper divisors (22782831).

28347825 is a wasteful number, since it uses less digits than its factorization.

28347825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34385 (or 34380 counting only the distinct ones).

The product of its digits is 107520, while the sum is 39.

The square root of 28347825 is about 5324.2675552605. The cubic root of 28347825 is about 304.9111090952.

The spelling of 28347825 in words is "twenty-eight million, three hundred forty-seven thousand, eight hundred twenty-five".