28777620879 has 12 divisors (see below), whose sum is σ = 47505913936. Its totient is φ = 16444354752.

The previous prime is 28777620877. The next prime is 28777620889. The reversal of 28777620879 is 97802677782.

It is not a de Polignac number, because 28777620879 - 2¹ = 28777620877 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63), and also a Moran number because the ratio is a prime number: 456787633 = 28777620879 / (2 + 8 + 7 + 7 + 7 + 6 + 2 + 0 + 8 + 7 + 9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28777620877) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 228393754 + ... + 228393879.

Almost surely, 2^28777620879 is an apocalyptic number.

28777620879 is a deficient number, since it is larger than the sum of its proper divisors (18728293057).

28777620879 is a wasteful number, since it uses less digits than its factorization.

28777620879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 456787646 (or 456787643 counting only the distinct ones).

The product of its (nonzero) digits is 33191424, while the sum is 63.

The spelling of 28777620879 in words is "twenty-eight billion, seven hundred seventy-seven million, six hundred twenty thousand, eight hundred seventy-nine".