28163780811 has 8 divisors (see below), whose sum is σ = 41724119760. Its totient is φ = 18775853856.

The previous prime is 28163780809. The next prime is 28163780839. The reversal of 28163780811 is 11808736182.

It is a happy number.

28163780811 is a `hidden beast` number, since 2 + 8 + 1 + 637 + 8 + 0 + 8 + 1 + 1 = 666.

It is not a de Polignac number, because 28163780811 - 2¹ = 28163780809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28163780851) 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 7 ways as a sum of consecutive naturals, for example, 521551470 + ... + 521551523.

It is an arithmetic number, because the mean of its divisors is an integer number (5215514970).

Almost surely, 2^28163780811 is an apocalyptic number.

28163780811 is a deficient number, since it is larger than the sum of its proper divisors (13560338949).

28163780811 is a wasteful number, since it uses less digits than its factorization.

28163780811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1043103002 (or 1043102996 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 45.

The spelling of 28163780811 in words is "twenty-eight billion, one hundred sixty-three million, seven hundred eighty thousand, eight hundred eleven".