28198761972 has 12 divisors (see below), whose sum is σ = 65797111296. Its totient is φ = 9399587320.

The previous prime is 28198761947. The next prime is 28198761977. The reversal of 28198761972 is 27916789182.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28198761977) 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, 1174948404 + ... + 1174948427.

It is an arithmetic number, because the mean of its divisors is an integer number (5483092608).

Almost surely, 2^28198761972 is an apocalyptic number.

It is an amenable number.

28198761972 is an abundant number, since it is smaller than the sum of its proper divisors (37598349324).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28198761972 is a wasteful number, since it uses less digits than its factorization.

28198761972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2349896838 (or 2349896836 counting only the distinct ones).

The product of its digits is 6096384, while the sum is 60.

The spelling of 28198761972 in words is "twenty-eight billion, one hundred ninety-eight million, seven hundred sixty-one thousand, nine hundred seventy-two".