28207975817 has 8 divisors (see below), whose sum is σ = 32258219712. Its totient is φ = 24162865200.

The previous prime is 28207975811. The next prime is 28207975819. The reversal of 28207975817 is 71857970282.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28207975817 - 2⁴ = 28207975801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28207975811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1271534 + ... + 1293527.

It is an arithmetic number, because the mean of its divisors is an integer number (4032277464).

Almost surely, 2^28207975817 is an apocalyptic number.

It is an amenable number.

28207975817 is a deficient number, since it is larger than the sum of its proper divisors (4050243895).

28207975817 is a wasteful number, since it uses less digits than its factorization.

28207975817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2566639.

The product of its (nonzero) digits is 3951360, while the sum is 56.

The spelling of 28207975817 in words is "twenty-eight billion, two hundred seven million, nine hundred seventy-five thousand, eight hundred seventeen".