28007825 has 6 divisors (see below), whose sum is σ = 34729734. Its totient is φ = 22406240.

The previous prime is 28007821. The next prime is 28007839. The reversal of 28007825 is 52870082.

It can be written as a sum of positive squares in 3 ways, for example, as 5121169 + 22886656 = 2263^2 + 4784^2 .

It is not a de Polignac number, because 28007825 - 2² = 28007821 is a prime.

It is a super-2 number, since 2×28007825² = 1568876522461250, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 28007791 and 28007800.

It is not an unprimeable number, because it can be changed into a prime (28007821) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 560132 + ... + 560181.

It is an arithmetic number, because the mean of its divisors is an integer number (5788289).

Almost surely, 2^28007825 is an apocalyptic number.

28007825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28007825 is a deficient number, since it is larger than the sum of its proper divisors (6721909).

28007825 is a wasteful number, since it uses less digits than its factorization.

28007825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1120323 (or 1120318 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 32.

The square root of 28007825 is about 5292.2419634782. The cubic root of 28007825 is about 303.6871818251.

The spelling of 28007825 in words is "twenty-eight million, seven thousand, eight hundred twenty-five".