28057728042 has 12 divisors (see below), whose sum is σ = 60791744130. Its totient is φ = 9352576008.

The previous prime is 28057728007. The next prime is 28057728073. The reversal of 28057728042 is 24082775082.

28057728042 is a `hidden beast` number, since 280 + 57 + 7 + 280 + 42 = 666.

It can be written as a sum of positive squares in only one way, i.e., 23195594601 + 4862133441 = 152301^2 + 69729^2 .

It is a super-2 number, since 2×28057728042² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 779381317 + ... + 779381352.

Almost surely, 2^28057728042 is an apocalyptic number.

28057728042 is an abundant number, since it is smaller than the sum of its proper divisors (32734016088).

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

28057728042 is a wasteful number, since it uses less digits than its factorization.

28057728042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1558762677 (or 1558762674 counting only the distinct ones).

The product of its (nonzero) digits is 501760, while the sum is 45.

The spelling of 28057728042 in words is "twenty-eight billion, fifty-seven million, seven hundred twenty-eight thousand, forty-two".