28277320189 has 16 divisors (see below), whose sum is σ = 30197385216. Its totient is φ = 26431056000.

The previous prime is 28277320187. The next prime is 28277320193. The reversal of 28277320189 is 98102377282.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 28277320189 - 2¹ = 28277320187 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 (28277320187) 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, 67164 + ... + 247114.

It is an arithmetic number, because the mean of its divisors is an integer number (1887336576).

Almost surely, 2^28277320189 is an apocalyptic number.

It is an amenable number.

28277320189 is a deficient number, since it is larger than the sum of its proper divisors (1920065027).

28277320189 is a wasteful number, since it uses less digits than its factorization.

28277320189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180156.

The product of its (nonzero) digits is 677376, while the sum is 49.

The spelling of 28277320189 in words is "twenty-eight billion, two hundred seventy-seven million, three hundred twenty thousand, one hundred eighty-nine".