28388661408 has 48 divisors (see below), whose sum is σ = 82800264960. Its totient is φ = 9462886848.

The previous prime is 28388661391. The next prime is 28388661481. The reversal of 28388661408 is 80416688382.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16427760 + ... + 16429487.

It is an arithmetic number, because the mean of its divisors is an integer number (1725005520).

Almost surely, 2^28388661408 is an apocalyptic number.

It is an amenable number.

28388661408 is an abundant number, since it is smaller than the sum of its proper divisors (54411603552).

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

28388661408 is a wasteful number, since it uses less digits than its factorization.

28388661408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32857266 (or 32857252 counting only the distinct ones).

The product of its (nonzero) digits is 3538944, while the sum is 54.

The spelling of 28388661408 in words is "twenty-eight billion, three hundred eighty-eight million, six hundred sixty-one thousand, four hundred eight".