28556544197 has 16 divisors (see below), whose sum is σ = 29816878080. Its totient is φ = 27328719600.

The previous prime is 28556544193. The next prime is 28556544221. The reversal of 28556544197 is 79144565582.

It is a cyclic number.

It is not a de Polignac number, because 28556544197 - 2² = 28556544193 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 (28556544193) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 412922 + ... + 477092.

It is an arithmetic number, because the mean of its divisors is an integer number (1863554880).

Almost surely, 2^28556544197 is an apocalyptic number.

It is an amenable number.

28556544197 is a deficient number, since it is larger than the sum of its proper divisors (1260333883).

28556544197 is a wasteful number, since it uses less digits than its factorization.

28556544197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64424.

The product of its digits is 12096000, while the sum is 56.

The spelling of 28556544197 in words is "twenty-eight billion, five hundred fifty-six million, five hundred forty-four thousand, one hundred ninety-seven".