28197079 has 4 divisors (see below), whose sum is σ = 28476360. Its totient is φ = 27917800.

The previous prime is 28197061. The next prime is 28197119. The reversal of 28197079 is 97079182.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 28197079 - 2⁵ = 28197047 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 (28197049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 139489 + ... + 139690.

It is an arithmetic number, because the mean of its divisors is an integer number (7119090).

Almost surely, 2^28197079 is an apocalyptic number.

28197079 is a deficient number, since it is larger than the sum of its proper divisors (279281).

28197079 is a wasteful number, since it uses less digits than its factorization.

28197079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279280.

The product of its (nonzero) digits is 63504, while the sum is 43.

The square root of 28197079 is about 5310.0921837573. The cubic root of 28197079 is about 304.3696701840.

The spelling of 28197079 in words is "twenty-eight million, one hundred ninety-seven thousand, seventy-nine".