28893831989 has 4 divisors (see below), whose sum is σ = 31520544000. Its totient is φ = 26267119980.

The previous prime is 28893831961. The next prime is 28893832003. The reversal of 28893831989 is 98913839882.

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 a de Polignac number, because none of the positive numbers 2^k-28893831989 is a prime.

It is a super-2 number, since 2×28893831989² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28893831929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1313355989 + ... + 1313356010.

It is an arithmetic number, because the mean of its divisors is an integer number (7880136000).

Almost surely, 2^28893831989 is an apocalyptic number.

It is an amenable number.

28893831989 is a deficient number, since it is larger than the sum of its proper divisors (2626712011).

28893831989 is a wasteful number, since it uses less digits than its factorization.

28893831989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2626712010.

The product of its digits is 53747712, while the sum is 68.

The spelling of 28893831989 in words is "twenty-eight billion, eight hundred ninety-three million, eight hundred thirty-one thousand, nine hundred eighty-nine".