28205666949 has 16 divisors (see below), whose sum is σ = 38488329792. Its totient is φ = 18363531648.

The previous prime is 28205666941. The next prime is 28205666971. The reversal of 28205666949 is 94966650282.

It is a happy number.

It is not a de Polignac number, because 28205666949 - 2³ = 28205666941 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28205666941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1030489 + ... + 1057505.

It is an arithmetic number, because the mean of its divisors is an integer number (2405520612).

Almost surely, 2^28205666949 is an apocalyptic number.

It is an amenable number.

28205666949 is a deficient number, since it is larger than the sum of its proper divisors (10282662843).

28205666949 is a wasteful number, since it uses less digits than its factorization.

28205666949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35156.

The product of its (nonzero) digits is 11197440, while the sum is 57.

The spelling of 28205666949 in words is "twenty-eight billion, two hundred five million, six hundred sixty-six thousand, nine hundred forty-nine".