28392163665 has 32 divisors (see below), whose sum is σ = 45639002880. Its totient is φ = 15072067584.

The previous prime is 28392163661. The next prime is 28392163673. The reversal of 28392163665 is 56636129382.

It is not a de Polignac number, because 28392163665 - 2² = 28392163661 is a prime.

It is a super-2 number, since 2×28392163665² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28392163661) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8043621 + ... + 8047149.

It is an arithmetic number, because the mean of its divisors is an integer number (1426218840).

Almost surely, 2^28392163665 is an apocalyptic number.

It is an amenable number.

28392163665 is a deficient number, since it is larger than the sum of its proper divisors (17246839215).

28392163665 is a wasteful number, since it uses less digits than its factorization.

28392163665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5881.

The product of its digits is 2799360, while the sum is 51.

The spelling of 28392163665 in words is "twenty-eight billion, three hundred ninety-two million, one hundred sixty-three thousand, six hundred sixty-five".