28920980238 has 16 divisors (see below), whose sum is σ = 58165102080. Its totient is φ = 9586469816.

The previous prime is 28920980233. The next prime is 28920980273. The reversal of 28920980238 is 83208902982.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28920980233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13463070 + ... + 13465217.

It is an arithmetic number, because the mean of its divisors is an integer number (3635318880).

Almost surely, 2^28920980238 is an apocalyptic number.

28920980238 is an abundant number, since it is smaller than the sum of its proper divisors (29244121842).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28920980238 is a wasteful number, since it uses less digits than its factorization.

28920980238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26928471.

The product of its (nonzero) digits is 995328, while the sum is 51.

The spelling of 28920980238 in words is "twenty-eight billion, nine hundred twenty million, nine hundred eighty thousand, two hundred thirty-eight".