28057728064 has 28 divisors (see below), whose sum is σ = 58952177244. Its totient is φ = 13203636224.

The previous prime is 28057728007. The next prime is 28057728073. The reversal of 28057728064 is 46082775082.

It can be written as a sum of positive squares in 2 ways, for example, as 23101568064 + 4956160000 = 151992^2 + 70400^2 .

It is a super-2 number, since 2×28057728064² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28057727999 and 28057728017.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12893089 + ... + 12895264.

Almost surely, 2^28057728064 is an apocalyptic number.

It is an amenable number.

28057728064 is an abundant number, since it is smaller than the sum of its proper divisors (30894449180).

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

28057728064 is a wasteful number, since it uses less digits than its factorization.

28057728064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25788382 (or 25788372 counting only the distinct ones).

The product of its (nonzero) digits is 1505280, while the sum is 49.

The spelling of 28057728064 in words is "twenty-eight billion, fifty-seven million, seven hundred twenty-eight thousand, sixty-four".