28907229817 has 4 divisors (see below), whose sum is σ = 30164065920. Its totient is φ = 27650393716.

The previous prime is 28907229803. The next prime is 28907229829. The reversal of 28907229817 is 71892270982.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28907229817 - 2¹⁵ = 28907197049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28907229877) 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 3 ways as a sum of consecutive naturals, for example, 628418017 + ... + 628418062.

It is an arithmetic number, because the mean of its divisors is an integer number (7541016480).

Almost surely, 2^28907229817 is an apocalyptic number.

It is an amenable number.

28907229817 is a deficient number, since it is larger than the sum of its proper divisors (1256836103).

28907229817 is a wasteful number, since it uses less digits than its factorization.

28907229817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1256836102.

The product of its (nonzero) digits is 2032128, while the sum is 55.

The spelling of 28907229817 in words is "twenty-eight billion, nine hundred seven million, two hundred twenty-nine thousand, eight hundred seventeen".