28227696121 has 9 divisors (see below), whose sum is σ = 29988856911. Its totient is φ = 26564555232.

The previous prime is 28227696097. The next prime is 28227696179. The reversal of 28227696121 is 12169672282.

The square root of 28227696121 is 168011.

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., 21976580025 + 6251116096 = 148245^2 + 79064^2 .

It is not a de Polignac number, because 28227696121 - 2¹¹ = 28227694073 is a prime.

It is a super-4 number, since 4×28227696121⁴ (a number of 43 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28227396121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2851246 + ... + 2861128.

Almost surely, 2^28227696121 is an apocalyptic number.

28227696121 is the 168011-st square number.

28227696121 is the 84006-th centered octagonal number.

It is an amenable number.

28227696121 is a deficient number, since it is larger than the sum of its proper divisors (1761160790).

28227696121 is an frugal number, since it uses more digits than its factorization.

28227696121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19800 (or 9900 counting only the distinct ones).

The product of its digits is 290304, while the sum is 46.

The spelling of 28227696121 in words is "twenty-eight billion, two hundred twenty-seven million, six hundred ninety-six thousand, one hundred twenty-one".