28386439776 has 72 divisors (see below), whose sum is σ = 80750386080. Its totient is φ = 9459046656.

The previous prime is 28386439691. The next prime is 28386439787. The reversal of 28386439776 is 67793468382.

It is a tau number, because it is divible by the number of its divisors (72).

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 968505 + ... + 997383.

It is an arithmetic number, because the mean of its divisors is an integer number (1121533140).

Almost surely, 2^28386439776 is an apocalyptic number.

It is an amenable number.

28386439776 is an abundant number, since it is smaller than the sum of its proper divisors (52363946304).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28386439776 is a wasteful number, since it uses less digits than its factorization.

28386439776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32308 (or 32297 counting only the distinct ones).

The product of its digits is 73156608, while the sum is 63.

The spelling of 28386439776 in words is "twenty-eight billion, three hundred eighty-six million, four hundred thirty-nine thousand, seven hundred seventy-six".