28272921192 has 24 divisors (see below), whose sum is σ = 76572495090. Its totient is φ = 9424307040.

The previous prime is 28272921191. The next prime is 28272921199. The reversal of 28272921192 is 29112927282.

28272921192 is a `hidden beast` number, since 282 + 72 + 9 + 211 + 92 = 666.

It can be written as a sum of positive squares in only one way, i.e., 23924046276 + 4348874916 = 154674^2 + 65946^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is not an unprimeable number, because it can be changed into a prime (28272921191) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 196339659 + ... + 196339802.

Almost surely, 2^28272921192 is an apocalyptic number.

It is an amenable number.

28272921192 is an abundant number, since it is smaller than the sum of its proper divisors (48299573898).

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

28272921192 is a wasteful number, since it uses less digits than its factorization.

28272921192 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 392679473 (or 392679466 counting only the distinct ones).

The product of its digits is 145152, while the sum is 45.

The spelling of 28272921192 in words is "twenty-eight billion, two hundred seventy-two million, nine hundred twenty-one thousand, one hundred ninety-two".