28380025 has 6 divisors (see below), whose sum is σ = 35191262. Its totient is φ = 22704000.

The previous prime is 28380019. The next prime is 28380083. The reversal of 28380025 is 52008382.

It can be written as a sum of positive squares in 3 ways, for example, as 3059001 + 25321024 = 1749^2 + 5032^2 .

It is not a de Polignac number, because 28380025 - 2⁵ = 28379993 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28379975 and 28380002.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 567576 + ... + 567625.

Almost surely, 2^28380025 is an apocalyptic number.

28380025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28380025 is a deficient number, since it is larger than the sum of its proper divisors (6811237).

28380025 is a wasteful number, since it uses less digits than its factorization.

28380025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1135211 (or 1135206 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 28380025 is about 5327.2905871559. The cubic root of 28380025 is about 305.0265138646.

It can be divided in two parts, 283 and 80025, that added together give a palindrome (80308).

The spelling of 28380025 in words is "twenty-eight million, three hundred eighty thousand, twenty-five".