28097279 has 4 divisors (see below), whose sum is σ = 32111184. Its totient is φ = 24083376.

The previous prime is 28097233. The next prime is 28097287. The reversal of 28097279 is 97279082.

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 28097279 - 2¹² = 28093183 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28097479) 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, 2006942 + ... + 2006955.

It is an arithmetic number, because the mean of its divisors is an integer number (8027796).

Almost surely, 2^28097279 is an apocalyptic number.

28097279 is a deficient number, since it is larger than the sum of its proper divisors (4013905).

28097279 is an equidigital number, since it uses as much as digits as its factorization.

28097279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4013904.

The product of its (nonzero) digits is 127008, while the sum is 44.

The square root of 28097279 is about 5300.6866536327. The cubic root of 28097279 is about 304.0101530254.

The spelling of 28097279 in words is "twenty-eight million, ninety-seven thousand, two hundred seventy-nine".