28978128829479 has 16 divisors (see below), whose sum is σ = 40045814879840. Its totient is φ = 18624178005120.

The previous prime is 28978128829477. The next prime is 28978128829511. The reversal of 28978128829479 is 97492882187982.

It is not a de Polignac number, because 28978128829479 - 2¹ = 28978128829477 is a prime.

It is a super-2 number, since 2×28978128829479² (a number of 28 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 (28978128829471) 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, 1197530212 + ... + 1197554409.

It is an arithmetic number, because the mean of its divisors is an integer number (2502863429990).

Almost surely, 2^{28978128829479} is an apocalyptic number.

28978128829479 is a deficient number, since it is larger than the sum of its proper divisors (11067686050361).

28978128829479 is a wasteful number, since it uses less digits than its factorization.

28978128829479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2395084770.

The product of its digits is 4682022912, while the sum is 84.

The spelling of 28978128829479 in words is "twenty-eight trillion, nine hundred seventy-eight billion, one hundred twenty-eight million, eight hundred twenty-nine thousand, four hundred seventy-nine".