28057728208 has 20 divisors (see below), whose sum is σ = 54503797248. Its totient is φ = 13992232160.

The previous prime is 28057728187. The next prime is 28057728253. The reversal of 28057728208 is 80282775082.

It is a super-2 number, since 2×28057728208² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 2283178 + ... + 2295433.

Almost surely, 2^28057728208 is an apocalyptic number.

It is an amenable number.

28057728208 is a deficient number, since it is larger than the sum of its proper divisors (26446069040).

28057728208 is a wasteful number, since it uses less digits than its factorization.

28057728208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4579002 (or 4578996 counting only the distinct ones).

The product of its (nonzero) digits is 1003520, while the sum is 49.

The spelling of 28057728208 in words is "twenty-eight billion, fifty-seven million, seven hundred twenty-eight thousand, two hundred eight".