28172807051 has 4 divisors (see below), whose sum is σ = 28176682632. Its totient is φ = 28168931472.

The previous prime is 28172807027. The next prime is 28172807059. The reversal of 28172807051 is 15070827182.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28172807051 - 2¹⁰ = 28172806027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28172807059) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1926866 + ... + 1941431.

It is an arithmetic number, because the mean of its divisors is an integer number (7044170658).

Almost surely, 2^28172807051 is an apocalyptic number.

28172807051 is a deficient number, since it is larger than the sum of its proper divisors (3875581).

28172807051 is an equidigital number, since it uses as much as digits as its factorization.

28172807051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3875580.

The product of its (nonzero) digits is 62720, while the sum is 41.

The spelling of 28172807051 in words is "twenty-eight billion, one hundred seventy-two million, eight hundred seven thousand, fifty-one".