28057728063 has 8 divisors (see below), whose sum is σ = 37639815808. Its totient is φ = 18590396184.

The previous prime is 28057728007. The next prime is 28057728073. The reversal of 28057728063 is 36082775082.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28057728063 - 2¹⁷ = 28057596991 is a prime.

It is a super-2 number, since 2×28057728063² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28057728073) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28688395 + ... + 28689372.

It is an arithmetic number, because the mean of its divisors is an integer number (4704976976).

Almost surely, 2^28057728063 is an apocalyptic number.

28057728063 is a deficient number, since it is larger than the sum of its proper divisors (9582087745).

28057728063 is a wasteful number, since it uses less digits than its factorization.

28057728063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57377933.

The product of its (nonzero) digits is 1128960, while the sum is 48.

The spelling of 28057728063 in words is "twenty-eight billion, fifty-seven million, seven hundred twenty-eight thousand, sixty-three".