28078566011 has 16 divisors (see below), whose sum is σ = 28535322816. Its totient is φ = 27625921536.

The previous prime is 28078565981. The next prime is 28078566049. The reversal of 28078566011 is 11066587082.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 28078566011 - 2¹⁸ = 28078303867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28078566071) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14230421 + ... + 14232393.

It is an arithmetic number, because the mean of its divisors is an integer number (1783457676).

Almost surely, 2^28078566011 is an apocalyptic number.

28078566011 is a deficient number, since it is larger than the sum of its proper divisors (456756805).

28078566011 is a wasteful number, since it uses less digits than its factorization.

28078566011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2902.

The product of its (nonzero) digits is 161280, while the sum is 44.

The spelling of 28078566011 in words is "twenty-eight billion, seventy-eight million, five hundred sixty-six thousand, eleven".