28102825 has 6 divisors (see below), whose sum is σ = 34847534. Its totient is φ = 22482240.

The previous prime is 28102817. The next prime is 28102831. The reversal of 28102825 is 52820182.

It can be written as a sum of positive squares in 3 ways, for example, as 393129 + 27709696 = 627^2 + 5264^2 .

It is not a de Polignac number, because 28102825 - 2³ = 28102817 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28102793 and 28102802.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 562032 + ... + 562081.

Almost surely, 2^28102825 is an apocalyptic number.

28102825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28102825 is a deficient number, since it is larger than the sum of its proper divisors (6744709).

28102825 is a wasteful number, since it uses less digits than its factorization.

28102825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1124123 (or 1124118 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 28.

The square root of 28102825 is about 5301.2097675908. The cubic root of 28102825 is about 304.0301541245.

The spelling of 28102825 in words is "twenty-eight million, one hundred two thousand, eight hundred twenty-five".