28381725 has 48 divisors (see below), whose sum is σ = 54907200. Its totient is φ = 14333760.

The previous prime is 28381711. The next prime is 28381729. The reversal of 28381725 is 52718382.

It is not a de Polignac number, because 28381725 - 2⁵ = 28381693 is a prime.

Its product of digits (26880) is a multiple of the sum of its prime divisors (2240).

It is a self number, because there is not a number n which added to its sum of digits gives 28381725.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28381729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 11719 + ... + 13931.

It is an arithmetic number, because the mean of its divisors is an integer number (1143900).

Almost surely, 2^28381725 is an apocalyptic number.

28381725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28381725 is a deficient number, since it is larger than the sum of its proper divisors (26525475).

28381725 is a wasteful number, since it uses less digits than its factorization.

28381725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2251 (or 2240 counting only the distinct ones).

The product of its digits is 26880, while the sum is 36.

The square root of 28381725 is about 5327.4501405457. The cubic root of 28381725 is about 305.0326042364.

The spelling of 28381725 in words is "twenty-eight million, three hundred eighty-one thousand, seven hundred twenty-five".