28332731639978 has 4 divisors (see below), whose sum is σ = 42499097459970. Its totient is φ = 14166365819988.

The previous prime is 28332731639977. The next prime is 28332731639983. The reversal of 28332731639978 is 87993613723382.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 19355978608849 + 8976753031129 = 4399543^2 + 2996123^2 .

It is not an unprimeable number, because it can be changed into a prime (28332731639977) 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 as a sum of consecutive naturals, namely, 7083182909993 + ... + 7083182909996.

Almost surely, 2^{28332731639978} is an apocalyptic number.

28332731639978 is a deficient number, since it is larger than the sum of its proper divisors (14166365819992).

28332731639978 is a wasteful number, since it uses less digits than its factorization.

28332731639978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14166365819991.

The product of its digits is 493807104, while the sum is 71.

The spelling of 28332731639978 in words is "twenty-eight trillion, three hundred thirty-two billion, seven hundred thirty-one million, six hundred thirty-nine thousand, nine hundred seventy-eight".