28203197 has 4 divisors (see below), whose sum is σ = 30767136. Its totient is φ = 25639260.

The previous prime is 28203179. The next prime is 28203199. The reversal of 28203197 is 79130282.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28203197 - 2¹⁰ = 28202173 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 (28203199) 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, 1281953 + ... + 1281974.

It is an arithmetic number, because the mean of its divisors is an integer number (7691784).

Almost surely, 2^28203197 is an apocalyptic number.

It is an amenable number.

28203197 is a deficient number, since it is larger than the sum of its proper divisors (2563939).

28203197 is a wasteful number, since it uses less digits than its factorization.

28203197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2563938.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 28203197 is about 5310.6682253743. The cubic root of 28203197 is about 304.3916819082.

The spelling of 28203197 in words is "twenty-eight million, two hundred three thousand, one hundred ninety-seven".