28818797121 has 27 divisors (see below), whose sum is σ = 42274749283. Its totient is φ = 18918165840.

The previous prime is 28818797113. The next prime is 28818797191. The reversal of 28818797121 is 12179781882.

The square root of 28818797121 is 169761.

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

It can be written as a sum of positive squares in only one way, i.e., 13974786225 + 14844010896 = 118215^2 + 121836^2 .

It is not a de Polignac number, because 28818797121 - 2³ = 28818797113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28818797191) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 36158695 + ... + 36159491.

Almost surely, 2^28818797121 is an apocalyptic number.

28818797121 is the 169761-st square number.

28818797121 is the 84881-st centered octagonal number.

It is an amenable number.

28818797121 is a deficient number, since it is larger than the sum of its proper divisors (13455952162).

28818797121 is an frugal number, since it uses more digits than its factorization.

28818797121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1742 (or 871 counting only the distinct ones).

The product of its digits is 903168, while the sum is 54.

The spelling of 28818797121 in words is "twenty-eight billion, eight hundred eighteen million, seven hundred ninety-seven thousand, one hundred twenty-one".