28198277 has 4 divisors (see below), whose sum is σ = 28213056. Its totient is φ = 28183500.

The previous prime is 28198273. The next prime is 28198301. The reversal of 28198277 is 77289182.

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 28198277 - 2² = 28198273 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 (28198273) 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, 4013 + ... + 8514.

It is an arithmetic number, because the mean of its divisors is an integer number (7053264).

Almost surely, 2^28198277 is an apocalyptic number.

It is an amenable number.

28198277 is a deficient number, since it is larger than the sum of its proper divisors (14779).

28198277 is a wasteful number, since it uses less digits than its factorization.

28198277 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14778.

The product of its digits is 112896, while the sum is 44.

The square root of 28198277 is about 5310.2049866272. The cubic root of 28198277 is about 304.3739806742.

The spelling of 28198277 in words is "twenty-eight million, one hundred ninety-eight thousand, two hundred seventy-seven".