28057731044 has 72 divisors (see below), whose sum is σ = 58281144768. Its totient is φ = 11781322560.

The previous prime is 28057731011. The next prime is 28057731049. The reversal of 28057731044 is 44013775082.

It is a junction number, because it is equal to n+sod(n) for n = 28057730992 and 28057731010.

It is not an unprimeable number, because it can be changed into a prime (28057731049) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3139967 + ... + 3148889.

It is an arithmetic number, because the mean of its divisors is an integer number (809460344).

Almost surely, 2^28057731044 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28057731044, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29140572384).

28057731044 is an abundant number, since it is smaller than the sum of its proper divisors (30223413724).

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

28057731044 is a wasteful number, since it uses less digits than its factorization.

28057731044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9265 (or 9256 counting only the distinct ones).

The product of its (nonzero) digits is 188160, while the sum is 41.

The spelling of 28057731044 in words is "twenty-eight billion, fifty-seven million, seven hundred thirty-one thousand, forty-four".