28172164738 has 8 divisors (see below), whose sum is σ = 42302873232. Its totient is φ = 14071206996.

The previous prime is 28172164723. The next prime is 28172164751. The reversal of 28172164738 is 83746127182.

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

It is a junction number, because it is equal to n+sod(n) for n = 28172164691 and 28172164700.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7435320 + ... + 7439107.

It is an arithmetic number, because the mean of its divisors is an integer number (5287859154).

Almost surely, 2^28172164738 is an apocalyptic number.

28172164738 is a deficient number, since it is larger than the sum of its proper divisors (14130708494).

28172164738 is a wasteful number, since it uses less digits than its factorization.

28172164738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14875376.

The product of its digits is 903168, while the sum is 49.

The spelling of 28172164738 in words is "twenty-eight billion, one hundred seventy-two million, one hundred sixty-four thousand, seven hundred thirty-eight".