28447617779 has 16 divisors (see below), whose sum is σ = 34411802880. Its totient is φ = 22972675680.

The previous prime is 28447617727. The next prime is 28447617787. The reversal of 28447617779 is 97771674482.

It is a cyclic number.

It is not a de Polignac number, because 28447617779 - 2²⁸ = 28179182323 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28447617179) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 566789 + ... + 614934.

It is an arithmetic number, because the mean of its divisors is an integer number (2150737680).

Almost surely, 2^28447617779 is an apocalyptic number.

28447617779 is a deficient number, since it is larger than the sum of its proper divisors (5964185101).

28447617779 is a wasteful number, since it uses less digits than its factorization.

28447617779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1181930.

The product of its digits is 33191424, while the sum is 62.

The spelling of 28447617779 in words is "twenty-eight billion, four hundred forty-seven million, six hundred seventeen thousand, seven hundred seventy-nine".