28528360871 has 4 divisors (see below), whose sum is σ = 28529782632. Its totient is φ = 28526939112.

The previous prime is 28528360837. The next prime is 28528360873. The reversal of 28528360871 is 17806382582.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17806382582 = 2 ⋅8903191291.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28528360871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28528360873) 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 3 ways as a sum of consecutive naturals, for example, 680345 + ... + 721058.

It is an arithmetic number, because the mean of its divisors is an integer number (7132445658).

Almost surely, 2^28528360871 is an apocalyptic number.

28528360871 is a deficient number, since it is larger than the sum of its proper divisors (1421761).

28528360871 is a wasteful number, since it uses less digits than its factorization.

28528360871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1421760.

The product of its (nonzero) digits is 1290240, while the sum is 50.

The spelling of 28528360871 in words is "twenty-eight billion, five hundred twenty-eight million, three hundred sixty thousand, eight hundred seventy-one".