28432216865 has 32 divisors (see below), whose sum is σ = 38947819680. Its totient is φ = 19739049984.

The previous prime is 28432216861. The next prime is 28432216903. The reversal of 28432216865 is 56861223482.

It is a happy number.

It can be written as a sum of positive squares in 16 ways, for example, as 24139215424 + 4293001441 = 155368^2 + 65521^2 .

It is a cyclic number.

It is not a de Polignac number, because 28432216865 - 2² = 28432216861 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28432216861) 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 31 ways as a sum of consecutive naturals, for example, 1012697 + ... + 1040393.

It is an arithmetic number, because the mean of its divisors is an integer number (1217119365).

Almost surely, 2^28432216865 is an apocalyptic number.

It is an amenable number.

28432216865 is a deficient number, since it is larger than the sum of its proper divisors (10515602815).

28432216865 is a wasteful number, since it uses less digits than its factorization.

28432216865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28661.

The product of its digits is 1105920, while the sum is 47.

The spelling of 28432216865 in words is "twenty-eight billion, four hundred thirty-two million, two hundred sixteen thousand, eight hundred sixty-five".