28067019705 has 24 divisors (see below), whose sum is σ = 48664187208. Its totient is φ = 14964558336.

The previous prime is 28067019683. The next prime is 28067019707. The reversal of 28067019705 is 50791076082.

It can be written as a sum of positive squares in 4 ways, for example, as 5170185216 + 22896834489 = 71904^2 + 151317^2 .

It is not a de Polignac number, because 28067019705 - 2¹⁹ = 28066495417 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (28067019707) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 59329 + ... + 244241.

It is an arithmetic number, because the mean of its divisors is an integer number (2027674467).

Almost surely, 2^28067019705 is an apocalyptic number.

It is an amenable number.

28067019705 is a deficient number, since it is larger than the sum of its proper divisors (20597167503).

28067019705 is a wasteful number, since it uses less digits than its factorization.

28067019705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188297 (or 188294 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 45.

The spelling of 28067019705 in words is "twenty-eight billion, sixty-seven million, nineteen thousand, seven hundred five".