28057728850 has 72 divisors (see below), whose sum is σ = 54318015612. Its totient is φ = 10774425600.

The previous prime is 28057728827. The next prime is 28057728851. The reversal of 28057728850 is 5882775082.

It can be written as a sum of positive squares in 18 ways, for example, as 15388650601 + 12669078249 = 124051^2 + 112557^2 .

It is a super-2 number, since 2×28057728850² (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 (28057728851) 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 35 ways as a sum of consecutive naturals, for example, 64798234 + ... + 64798666.

Almost surely, 2^28057728850 is an apocalyptic number.

28057728850 is a deficient number, since it is larger than the sum of its proper divisors (26260286762).

28057728850 is an equidigital number, since it uses as much as digits as its factorization.

28057728850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 992 (or 554 counting only the distinct ones).

The product of its (nonzero) digits is 2508800, while the sum is 52.

The spelling of 28057728850 in words is "twenty-eight billion, fifty-seven million, seven hundred twenty-eight thousand, eight hundred fifty".