28198577 has 4 divisors (see below), whose sum is σ = 30762096. Its totient is φ = 25635060.

The previous prime is 28198571. The next prime is 28198589. The reversal of 28198577 is 77589182.

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 not a de Polignac number, because 28198577 - 2⁸ = 28198321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28198571) 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, 1281743 + ... + 1281764.

It is an arithmetic number, because the mean of its divisors is an integer number (7690524).

Almost surely, 2^28198577 is an apocalyptic number.

It is an amenable number.

28198577 is a deficient number, since it is larger than the sum of its proper divisors (2563519).

28198577 is a wasteful number, since it uses less digits than its factorization.

28198577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2563518.

The product of its digits is 282240, while the sum is 47.

The square root of 28198577 is about 5310.2332340491. The cubic root of 28198577 is about 304.3750600767.

The spelling of 28198577 in words is "twenty-eight million, one hundred ninety-eight thousand, five hundred seventy-seven".