28523725 has 6 divisors (see below), whose sum is σ = 35369450. Its totient is φ = 22818960.

The previous prime is 28523717. The next prime is 28523743. The reversal of 28523725 is 52732582.

It can be written as a sum of positive squares in 3 ways, for example, as 8219689 + 20304036 = 2867^2 + 4506^2 .

It is not a de Polignac number, because 28523725 - 2³ = 28523717 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 570450 + ... + 570499.

Almost surely, 2^28523725 is an apocalyptic number.

28523725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28523725 is a deficient number, since it is larger than the sum of its proper divisors (6845725).

28523725 is a wasteful number, since it uses less digits than its factorization.

28523725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1140959 (or 1140954 counting only the distinct ones).

The product of its digits is 33600, while the sum is 34.

The square root of 28523725 is about 5340.7607136063. The cubic root of 28523725 is about 305.5404732072.

The spelling of 28523725 in words is "twenty-eight million, five hundred twenty-three thousand, seven hundred twenty-five".