28147825 has 6 divisors (see below), whose sum is σ = 34903334. Its totient is φ = 22518240.

The previous prime is 28147813. The next prime is 28147831. The reversal of 28147825 is 52874182.

It can be written as a sum of positive squares in 3 ways, for example, as 2005056 + 26142769 = 1416^2 + 5113^2 .

It is not a de Polignac number, because 28147825 - 2⁵ = 28147793 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 562932 + ... + 562981.

Almost surely, 2^28147825 is an apocalyptic number.

28147825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28147825 is a deficient number, since it is larger than the sum of its proper divisors (6755509).

28147825 is a wasteful number, since it uses less digits than its factorization.

28147825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1125923 (or 1125918 counting only the distinct ones).

The product of its digits is 35840, while the sum is 37.

The square root of 28147825 is about 5305.4523841045. The cubic root of 28147825 is about 304.1923449475.

The spelling of 28147825 in words is "twenty-eight million, one hundred forty-seven thousand, eight hundred twenty-five".