28352779989 has 8 divisors (see below), whose sum is σ = 38516984352. Its totient is φ = 18545214480.

The previous prime is 28352779981. The next prime is 28352779993. The reversal of 28352779989 is 98997725382.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28352779989 - 2³ = 28352779981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28352779981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89159527 + ... + 89159844.

It is an arithmetic number, because the mean of its divisors is an integer number (4814623044).

Almost surely, 2^28352779989 is an apocalyptic number.

It is an amenable number.

28352779989 is a deficient number, since it is larger than the sum of its proper divisors (10164204363).

28352779989 is a wasteful number, since it uses less digits than its factorization.

28352779989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178319427.

The product of its digits is 137168640, while the sum is 69.

The spelling of 28352779989 in words is "twenty-eight billion, three hundred fifty-two million, seven hundred seventy-nine thousand, nine hundred eighty-nine".