28542197 has 4 divisors (see below), whose sum is σ = 28933260. Its totient is φ = 28151136.

The previous prime is 28542193. The next prime is 28542203. The reversal of 28542197 is 79124582.

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 19061956 + 9480241 = 4366^2 + 3079^2 .

It is not a de Polignac number, because 28542197 - 2² = 28542193 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28542197.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28542193) 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, 195422 + ... + 195567.

It is an arithmetic number, because the mean of its divisors is an integer number (7233315).

Almost surely, 2^28542197 is an apocalyptic number.

It is an amenable number.

28542197 is a deficient number, since it is larger than the sum of its proper divisors (391063).

28542197 is an equidigital number, since it uses as much as digits as its factorization.

28542197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391062.

The product of its digits is 40320, while the sum is 38.

The square root of 28542197 is about 5342.4897753763. The cubic root of 28542197 is about 305.6064151055.

The spelling of 28542197 in words is "twenty-eight million, five hundred forty-two thousand, one hundred ninety-seven".