28047725 has 12 divisors (see below), whose sum is σ = 34965396. Its totient is φ = 22318080.

The previous prime is 28047713. The next prime is 28047749. The reversal of 28047725 is 52774082.

It can be written as a sum of positive squares in 6 ways, for example, as 872356 + 27175369 = 934^2 + 5213^2 .

It is not a de Polignac number, because 28047725 - 2⁴ = 28047709 is a prime.

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1919 + ... + 7731.

It is an arithmetic number, because the mean of its divisors is an integer number (2913783).

Almost surely, 2^28047725 is an apocalyptic number.

28047725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28047725 is a deficient number, since it is larger than the sum of its proper divisors (6917671).

28047725 is a wasteful number, since it uses less digits than its factorization.

28047725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6016 (or 6011 counting only the distinct ones).

The product of its (nonzero) digits is 31360, while the sum is 35.

The square root of 28047725 is about 5296.0102907755. The cubic root of 28047725 is about 303.8313245077.

The spelling of 28047725 in words is "twenty-eight million, forty-seven thousand, seven hundred twenty-five".