28397979289 has 9 divisors (see below), whose sum is σ = 29081176533. Its totient is φ = 27730483452.

The previous prime is 28397979271. The next prime is 28397979301. The reversal of 28397979289 is 98297979382.

The square root of 28397979289 is 168517.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 28397979289 - 2¹¹ = 28397977241 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28397979889) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 7244272 + ... + 7248190.

It is an arithmetic number, because the mean of its divisors is an integer number (3231241837).

Almost surely, 2^28397979289 is an apocalyptic number.

28397979289 is the 168517-th square number.

28397979289 is the 84259-th centered octagonal number.

It is an amenable number.

28397979289 is a deficient number, since it is larger than the sum of its proper divisors (683197244).

28397979289 is an frugal number, since it uses more digits than its factorization.

28397979289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7924 (or 3962 counting only the distinct ones).

The product of its digits is 246903552, while the sum is 73.

The spelling of 28397979289 in words is "twenty-eight billion, three hundred ninety-seven million, nine hundred seventy-nine thousand, two hundred eighty-nine".