28159189249 has 9 divisors (see below), whose sum is σ = 29916079491. Its totient is φ = 26500081440.

The previous prime is 28159189243. The next prime is 28159189273. The reversal of 28159189249 is 94298195182.

The square root of 28159189249 is 167807.

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., 21923244225 + 6235945024 = 148065^2 + 78968^2 .

It is not a de Polignac number, because 28159189249 - 2²¹ = 28157092097 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28159189193 and 28159189202.

It is not an unprimeable number, because it can be changed into a prime (28159189243) 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, 2847784 + ... + 2857654.

Almost surely, 2^28159189249 is an apocalyptic number.

28159189249 is the 167807-th square number.

28159189249 is the 83904-th centered octagonal number.

It is an amenable number.

28159189249 is a deficient number, since it is larger than the sum of its proper divisors (1756890242).

28159189249 is an frugal number, since it uses more digits than its factorization.

28159189249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19776 (or 9888 counting only the distinct ones).

The product of its digits is 3732480, while the sum is 58.

The spelling of 28159189249 in words is "twenty-eight billion, one hundred fifty-nine million, one hundred eighty-nine thousand, two hundred forty-nine".