28200929 has 4 divisors (see below), whose sum is σ = 28733076. Its totient is φ = 27668784.

The previous prime is 28200923. The next prime is 28200941. The reversal of 28200929 is 92900282.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7480225 + 20720704 = 2735^2 + 4552^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28200929 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 28200895 and 28200904.

It is not an unprimeable number, because it can be changed into a prime (28200923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 265994 + ... + 266099.

It is an arithmetic number, because the mean of its divisors is an integer number (7183269).

Almost surely, 2^28200929 is an apocalyptic number.

It is an amenable number.

28200929 is a deficient number, since it is larger than the sum of its proper divisors (532147).

28200929 is an equidigital number, since it uses as much as digits as its factorization.

28200929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 532146.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 28200929 is about 5310.4546886307. The cubic root of 28200929 is about 304.3835223269.

The spelling of 28200929 in words is "twenty-eight million, two hundred thousand, nine hundred twenty-nine".