28138742744 has 24 divisors (see below), whose sum is σ = 61374044340. Its totient is φ = 12059461008.

The previous prime is 28138742719. The next prime is 28138742773. The reversal of 28138742744 is 44724783182.

It is a junction number, because it is equal to n+sod(n) for n = 28138742692 and 28138742701.

It is a congruent number.

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 5 ways as a sum of consecutive naturals, for example, 35890862 + ... + 35891645.

Almost surely, 2^28138742744 is an apocalyptic number.

It is an amenable number.

28138742744 is an abundant number, since it is smaller than the sum of its proper divisors (33235301596).

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

28138742744 is a wasteful number, since it uses less digits than its factorization.

28138742744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71782527 (or 71782516 counting only the distinct ones).

The product of its digits is 2408448, while the sum is 50.

The spelling of 28138742744 in words is "twenty-eight billion, one hundred thirty-eight million, seven hundred forty-two thousand, seven hundred forty-four".