28531197 has 10 divisors (see below), whose sum is σ = 42620798. Its totient is φ = 19020744.

The previous prime is 28531189. The next prime is 28531249. The reversal of 28531197 is 79113582.

It can be written as a sum of positive squares in only one way, i.e., 23097636 + 5433561 = 4806^2 + 2331^2 .

It is not a de Polignac number, because 28531197 - 2³ = 28531189 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 (28531127) 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 9 ways as a sum of consecutive naturals, for example, 176038 + ... + 176199.

Almost surely, 2^28531197 is an apocalyptic number.

28531197 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

28531197 is a deficient number, since it is larger than the sum of its proper divisors (14089601).

28531197 is an equidigital number, since it uses as much as digits as its factorization.

28531197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 352249 (or 352240 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The square root of 28531197 is about 5341.4601936175. The cubic root of 28531197 is about 305.5671504042.

The spelling of 28531197 in words is "twenty-eight million, five hundred thirty-one thousand, one hundred ninety-seven".