28445946849 has 10 divisors (see below), whose sum is σ = 42493328130. Its totient is φ = 18963964512.

The previous prime is 28445946811. The next prime is 28445946863. The reversal of 28445946849 is 94864954482.

28445946849 is a `hidden beast` number, since 2 + 8 + 445 + 94 + 68 + 49 = 666.

It can be written as a sum of positive squares in only one way, i.e., 22258551249 + 6187395600 = 149193^2 + 78660^2 .

It is not a de Polignac number, because 28445946849 - 2⁷ = 28445946721 is a prime.

It is a super-2 number, since 2×28445946849² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28445946149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 175592184 + ... + 175592345.

It is an arithmetic number, because the mean of its divisors is an integer number (4249332813).

Almost surely, 2^28445946849 is an apocalyptic number.

It is an amenable number.

28445946849 is a deficient number, since it is larger than the sum of its proper divisors (14047381281).

28445946849 is an equidigital number, since it uses as much as digits as its factorization.

28445946849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351184541 (or 351184532 counting only the distinct ones).

The product of its digits is 79626240, while the sum is 63.

The spelling of 28445946849 in words is "twenty-eight billion, four hundred forty-five million, nine hundred forty-six thousand, eight hundred forty-nine".