28007125 has 8 divisors (see below), whose sum is σ = 34953048. Its totient is φ = 22405600.

The previous prime is 28007117. The next prime is 28007137. The reversal of 28007125 is 52170082.

It can be written as a sum of positive squares in 4 ways, for example, as 54756 + 27952369 = 234^2 + 5287^2 .

It is not a de Polignac number, because 28007125 - 2³ = 28007117 is a prime.

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28007125.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 111904 + ... + 112153.

It is an arithmetic number, because the mean of its divisors is an integer number (4369131).

Almost surely, 2^28007125 is an apocalyptic number.

28007125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28007125 is a deficient number, since it is larger than the sum of its proper divisors (6945923).

28007125 is an equidigital number, since it uses as much as digits as its factorization.

28007125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224072 (or 224062 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 28007125 is about 5292.1758285227. The cubic root of 28007125 is about 303.6846517846.

The spelling of 28007125 in words is "twenty-eight million, seven thousand, one hundred twenty-five".