28172216372 has 12 divisors (see below), whose sum is σ = 49302664320. Its totient is φ = 14085740856.

The previous prime is 28172216357. The next prime is 28172216377. The reversal of 28172216372 is 27361227182.

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 pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 153629 + ... + 282747.

It is an arithmetic number, because the mean of its divisors is an integer number (4108555360).

Almost surely, 2^28172216372 is an apocalyptic number.

It is an amenable number.

28172216372 is a deficient number, since it is larger than the sum of its proper divisors (21130447948).

28172216372 is a wasteful number, since it uses less digits than its factorization.

28172216372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183670 (or 183668 counting only the distinct ones).

The product of its digits is 112896, while the sum is 41.

The spelling of 28172216372 in words is "twenty-eight billion, one hundred seventy-two million, two hundred sixteen thousand, three hundred seventy-two".