28172216373 has 64 divisors (see below), whose sum is σ = 45868032000. Its totient is φ = 15040295424.

The previous prime is 28172216357. The next prime is 28172216377. The reversal of 28172216373 is 37361227182.

It is a happy number.

It is not a de Polignac number, because 28172216373 - 2⁴ = 28172216357 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28172216377) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2541918 + ... + 2552976.

It is an arithmetic number, because the mean of its divisors is an integer number (716688000).

Almost surely, 2^28172216373 is an apocalyptic number.

It is an amenable number.

28172216373 is a deficient number, since it is larger than the sum of its proper divisors (17695815627).

28172216373 is a wasteful number, since it uses less digits than its factorization.

28172216373 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11234.

The product of its digits is 169344, while the sum is 42.

The spelling of 28172216373 in words is "twenty-eight billion, one hundred seventy-two million, two hundred sixteen thousand, three hundred seventy-three".