28194556389 has 32 divisors (see below), whose sum is σ = 41472331776. Its totient is φ = 16959932160.

The previous prime is 28194556381. The next prime is 28194556391. The reversal of 28194556389 is 98365549182.

It is not a de Polignac number, because 28194556389 - 2³ = 28194556381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28194556381) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 85834 + ... + 252500.

It is an arithmetic number, because the mean of its divisors is an integer number (1296010368).

Almost surely, 2^28194556389 is an apocalyptic number.

It is an amenable number.

28194556389 is a deficient number, since it is larger than the sum of its proper divisors (13277775387).

28194556389 is a wasteful number, since it uses less digits than its factorization.

28194556389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166825.

The product of its digits is 18662400, while the sum is 60.

The spelling of 28194556389 in words is "twenty-eight billion, one hundred ninety-four million, five hundred fifty-six thousand, three hundred eighty-nine".