28108978939 has 8 divisors (see below), whose sum is σ = 28262320128. Its totient is φ = 27955702440.

The previous prime is 28108978903. The next prime is 28108978979. The reversal of 28108978939 is 93987980182.

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

It is a cyclic number.

It is not a de Polignac number, because 28108978939 - 2¹⁵ = 28108946171 is a prime.

It is a super-2 number, since 2×28108978939² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28108978979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1042344 + ... + 1068970.

It is an arithmetic number, because the mean of its divisors is an integer number (3532790016).

Almost surely, 2^28108978939 is an apocalyptic number.

28108978939 is a deficient number, since it is larger than the sum of its proper divisors (153341189).

28108978939 is a wasteful number, since it uses less digits than its factorization.

28108978939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32345.

The product of its (nonzero) digits is 15676416, while the sum is 64.

The spelling of 28108978939 in words is "twenty-eight billion, one hundred eight million, nine hundred seventy-eight thousand, nine hundred thirty-nine".