28331438752 has 24 divisors (see below), whose sum is σ = 55782912276. Its totient is φ = 14164349952.

The previous prime is 28331438747. The next prime is 28331438771. The reversal of 28331438752 is 25783413382.

It can be written as a sum of positive squares in 2 ways, for example, as 24422188176 + 3909250576 = 156276^2 + 62524^2 .

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 348408 + ... + 421960.

Almost surely, 2^28331438752 is an apocalyptic number.

It is an amenable number.

28331438752 is a deficient number, since it is larger than the sum of its proper divisors (27451473524).

28331438752 is a wasteful number, since it uses less digits than its factorization.

28331438752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85600 (or 85592 counting only the distinct ones).

The product of its digits is 967680, while the sum is 46.

The spelling of 28331438752 in words is "twenty-eight billion, three hundred thirty-one million, four hundred thirty-eight thousand, seven hundred fifty-two".