28115144434 has 24 divisors (see below), whose sum is σ = 45673267500. Its totient is φ = 12903345312.

The previous prime is 28115144429. The next prime is 28115144443. The reversal of 28115144434 is 43444151182.

It can be written as a sum of positive squares in 2 ways, for example, as 28011043225 + 104101209 = 167365^2 + 10203^2 .

It is a super-2 number, since 2×28115144434² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28115144393 and 28115144402.

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, 816192 + ... + 849940.

Almost surely, 2^28115144434 is an apocalyptic number.

28115144434 is a deficient number, since it is larger than the sum of its proper divisors (17558123066).

28115144434 is a wasteful number, since it uses less digits than its factorization.

28115144434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34122 (or 33943 counting only the distinct ones).

The product of its digits is 61440, while the sum is 37.

The spelling of 28115144434 in words is "twenty-eight billion, one hundred fifteen million, one hundred forty-four thousand, four hundred thirty-four".