28418889297969 has 27 divisors (see below), whose sum is σ = 41157415414219. Its totient is φ = 18896252527680.

The previous prime is 28418889297947. The next prime is 28418889297979. The reversal of 28418889297969 is 96979298881482.

The square root of 28418889297969 is 5330937.

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

28418889297969 is a `hidden beast` number, since 2 + 8 + 4 + 188 + 89 + 297 + 9 + 69 = 666.

It can be written as a sum of positive squares in only one way, i.e., 27991644048369 + 427245249600 = 5290713^2 + 653640^2 .

It is not a de Polignac number, because 28418889297969 - 2¹¹ = 28418889295921 is a prime.

It is a super-2 number, since 2×28418889297969² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28418889297979) 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, 6700985689 + ... + 6700989929.

Almost surely, 2^{28418889297969} is an apocalyptic number.

28418889297969 is the 5330937-th square number.

28418889297969 is the 2665469-th centered octagonal number.

It is an amenable number.

28418889297969 is a deficient number, since it is larger than the sum of its proper divisors (12738526116250).

28418889297969 is an frugal number, since it uses more digits than its factorization.

28418889297969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9326 (or 4663 counting only the distinct ones).

The product of its digits is 18059231232, while the sum is 90.

The spelling of 28418889297969 in words is "twenty-eight trillion, four hundred eighteen billion, eight hundred eighty-nine million, two hundred ninety-seven thousand, nine hundred sixty-nine".