28020473671 has 4 divisors (see below), whose sum is σ = 28023341832. Its totient is φ = 28017605512.

The previous prime is 28020473651. The next prime is 28020473683. The reversal of 28020473671 is 17637402082.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17637402082 = 2 ⋅8818701041.

It is a cyclic number.

It is not a de Polignac number, because 28020473671 - 2⁵ = 28020473639 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 (28020473651) 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, 1419376 + ... + 1438981.

It is an arithmetic number, because the mean of its divisors is an integer number (7005835458).

Almost surely, 2^28020473671 is an apocalyptic number.

28020473671 is a deficient number, since it is larger than the sum of its proper divisors (2868161).

28020473671 is an equidigital number, since it uses as much as digits as its factorization.

28020473671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2868160.

The product of its (nonzero) digits is 112896, while the sum is 40.

The spelling of 28020473671 in words is "twenty-eight billion, twenty million, four hundred seventy-three thousand, six hundred seventy-one".