28780838012 has 12 divisors (see below), whose sum is σ = 53017333320. Its totient is φ = 13633028496.

The previous prime is 28780838011. The next prime is 28780838027. The reversal of 28780838012 is 21083808782.

It is a super-2 number, since 2×28780838012² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28780838011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 189347543 + ... + 189347694.

It is an arithmetic number, because the mean of its divisors is an integer number (4418111110).

Almost surely, 2^28780838012 is an apocalyptic number.

It is an amenable number.

28780838012 is a deficient number, since it is larger than the sum of its proper divisors (24236495308).

28780838012 is a wasteful number, since it uses less digits than its factorization.

28780838012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 378695260 (or 378695258 counting only the distinct ones).

The product of its (nonzero) digits is 344064, while the sum is 47.

The spelling of 28780838012 in words is "twenty-eight billion, seven hundred eighty million, eight hundred thirty-eight thousand, twelve".