28779665447 has 8 divisors (see below), whose sum is σ = 31190898816. Its totient is φ = 26396633952.

The previous prime is 28779665417. The next prime is 28779665491. The reversal of 28779665447 is 74456697782.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-28779665447 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28779665417) 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 7 ways as a sum of consecutive naturals, for example, 7048343 + ... + 7052424.

It is an arithmetic number, because the mean of its divisors is an integer number (3898862352).

Almost surely, 2^28779665447 is an apocalyptic number.

28779665447 is a deficient number, since it is larger than the sum of its proper divisors (2411233369).

28779665447 is a wasteful number, since it uses less digits than its factorization.

28779665447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14100937.

The product of its digits is 142248960, while the sum is 65.

The spelling of 28779665447 in words is "twenty-eight billion, seven hundred seventy-nine million, six hundred sixty-five thousand, four hundred forty-seven".