28087197 has 4 divisors (see below), whose sum is σ = 37449600. Its totient is φ = 18724796.

The previous prime is 28087183. The next prime is 28087201. The reversal of 28087197 is 79178082.

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 28087197 - 2⁶ = 28087133 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28087177) 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, 4681197 + ... + 4681202.

It is an arithmetic number, because the mean of its divisors is an integer number (9362400).

Almost surely, 2^28087197 is an apocalyptic number.

It is an amenable number.

28087197 is a deficient number, since it is larger than the sum of its proper divisors (9362403).

28087197 is an equidigital number, since it uses as much as digits as its factorization.

28087197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9362402.

The product of its (nonzero) digits is 56448, while the sum is 42.

The square root of 28087197 is about 5299.7355594407. The cubic root of 28087197 is about 303.9737865497.

The spelling of 28087197 in words is "twenty-eight million, eighty-seven thousand, one hundred ninety-seven".