28705982879 has 16 divisors (see below), whose sum is σ = 33019315200. Its totient is φ = 24446276064.

The previous prime is 28705982849. The next prime is 28705982887. The reversal of 28705982879 is 97828950782.

It is not a de Polignac number, because 28705982879 - 2¹⁶ = 28705917343 is a prime.

It is a super-2 number, since 2×28705982879² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28705982849) 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, 670292 + ... + 711830.

It is an arithmetic number, because the mean of its divisors is an integer number (2063707200).

Almost surely, 2^28705982879 is an apocalyptic number.

28705982879 is a deficient number, since it is larger than the sum of its proper divisors (4313332321).

28705982879 is a wasteful number, since it uses less digits than its factorization.

28705982879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42182.

The product of its (nonzero) digits is 40642560, while the sum is 65.

The spelling of 28705982879 in words is "twenty-eight billion, seven hundred five million, nine hundred eighty-two thousand, eight hundred seventy-nine".