28690336449 has 12 divisors (see below), whose sum is σ = 41656322916. Its totient is φ = 19027786752.

The previous prime is 28690336439. The next prime is 28690336453. The reversal of 28690336449 is 94463309682.

28690336449 is a `hidden beast` number, since 2 + 86 + 90 + 3 + 36 + 449 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 17424000000 + 11266336449 = 132000^2 + 106143^2 .

It is not a de Polignac number, because 28690336449 - 2⁵ = 28690336417 is a prime.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 28690336395 and 28690336404.

It is not an unprimeable number, because it can be changed into a prime (28690336429) 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 11 ways as a sum of consecutive naturals, for example, 8256852 + ... + 8260325.

It is an arithmetic number, because the mean of its divisors is an integer number (3471360243).

Almost surely, 2^28690336449 is an apocalyptic number.

It is an amenable number.

28690336449 is a deficient number, since it is larger than the sum of its proper divisors (12965986467).

28690336449 is a wasteful number, since it uses less digits than its factorization.

28690336449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16517376 (or 16517373 counting only the distinct ones).

The product of its (nonzero) digits is 6718464, while the sum is 54.

The spelling of 28690336449 in words is "twenty-eight billion, six hundred ninety million, three hundred thirty-six thousand, four hundred forty-nine".