28438025 has 72 divisors (see below), whose sum is σ = 47496960. Its totient is φ = 16473600.

The previous prime is 28438019. The next prime is 28438027. The reversal of 28438025 is 52083482.

It is not a de Polignac number, because 28438025 - 2⁸ = 28437769 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28437982 and 28438000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28438027) by changing a digit.

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 71 ways as a sum of consecutive naturals, for example, 359936 + ... + 360014.

It is an arithmetic number, because the mean of its divisors is an integer number (659680).

Almost surely, 2^28438025 is an apocalyptic number.

28438025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28438025 is a deficient number, since it is larger than the sum of its proper divisors (19058935).

28438025 is a wasteful number, since it uses less digits than its factorization.

28438025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135 (or 119 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 32.

The square root of 28438025 is about 5332.7314764574. The cubic root of 28438025 is about 305.2341657777.

The spelling of 28438025 in words is "twenty-eight million, four hundred thirty-eight thousand, twenty-five".