28156925 has 12 divisors (see below), whose sum is σ = 35173716. Its totient is φ = 22358400.

The previous prime is 28156871. The next prime is 28156927. The reversal of 28156925 is 52965182.

It can be written as a sum of positive squares in 6 ways, for example, as 835396 + 27321529 = 914^2 + 5227^2 .

It is not a de Polignac number, because 28156925 - 2¹⁰ = 28155901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28156927) by changing a digit.

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, 686 + ... + 7535.

It is an arithmetic number, because the mean of its divisors is an integer number (2931143).

Almost surely, 2^28156925 is an apocalyptic number.

28156925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28156925 is a deficient number, since it is larger than the sum of its proper divisors (7016791).

28156925 is a wasteful number, since it uses less digits than its factorization.

28156925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8368 (or 8363 counting only the distinct ones).

The product of its digits is 43200, while the sum is 38.

The square root of 28156925 is about 5306.3099231010. The cubic root of 28156925 is about 304.2251225195.

The spelling of 28156925 in words is "twenty-eight million, one hundred fifty-six thousand, nine hundred twenty-five".