28803825 has 36 divisors (see below), whose sum is σ = 51882220. Its totient is φ = 15275520.

The previous prime is 28803823. The next prime is 28803833. The reversal of 28803825 is 52830882.

It can be written as a sum of positive squares in 6 ways, for example, as 1774224 + 27029601 = 1332^2 + 5199^2 .

It is not a de Polignac number, because 28803825 - 2¹ = 28803823 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 28803825.

It is not an unprimeable number, because it can be changed into a prime (28803823) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 70221 + ... + 70629.

Almost surely, 2^28803825 is an apocalyptic number.

28803825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28803825 is a deficient number, since it is larger than the sum of its proper divisors (23078395).

28803825 is a wasteful number, since it uses less digits than its factorization.

28803825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 738 (or 730 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 36.

The square root of 28803825 is about 5366.9195075015. The cubic root of 28803825 is about 306.5373424196.

The spelling of 28803825 in words is "twenty-eight million, eight hundred three thousand, eight hundred twenty-five".