28057728451 has 16 divisors (see below), whose sum is σ = 29376691200. Its totient is φ = 26747200480.

The previous prime is 28057728449. The next prime is 28057728467. The reversal of 28057728451 is 15482775082.

It is a happy number.

It is not a de Polignac number, because 28057728451 - 2¹ = 28057728449 is a prime.

It is a super-2 number, since 2×28057728451² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28057728395 and 28057728404.

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 15 ways as a sum of consecutive naturals, for example, 10234941 + ... + 10237681.

It is an arithmetic number, because the mean of its divisors is an integer number (1836043200).

Almost surely, 2^28057728451 is an apocalyptic number.

28057728451 is a deficient number, since it is larger than the sum of its proper divisors (1318962749).

28057728451 is a wasteful number, since it uses less digits than its factorization.

28057728451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4106.

The product of its (nonzero) digits is 1254400, while the sum is 49.

The spelling of 28057728451 in words is "twenty-eight billion, fifty-seven million, seven hundred twenty-eight thousand, four hundred fifty-one".