28989421784 has 32 divisors (see below), whose sum is σ = 54717616800. Its totient is φ = 14398176000.

The previous prime is 28989421781. The next prime is 28989421807. The reversal of 28989421784 is 48712498982.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28989421781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2223284 + ... + 2236284.

It is an arithmetic number, because the mean of its divisors is an integer number (1709925525).

Almost surely, 2^28989421784 is an apocalyptic number.

It is an amenable number.

28989421784 is a deficient number, since it is larger than the sum of its proper divisors (25728195016).

28989421784 is a wasteful number, since it uses less digits than its factorization.

28989421784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14843 (or 14839 counting only the distinct ones).

The product of its digits is 18579456, while the sum is 62.

The spelling of 28989421784 in words is "twenty-eight billion, nine hundred eighty-nine million, four hundred twenty-one thousand, seven hundred eighty-four".