28539831394 has 4 divisors (see below), whose sum is σ = 42809747094. Its totient is φ = 14269915696.

The previous prime is 28539831371. The next prime is 28539831403. The reversal of 28539831394 is 49313893582.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 49313893582 = 2 ⋅24656946791.

It can be written as a sum of positive squares in only one way, i.e., 28270050769 + 269780625 = 168137^2 + 16425^2 .

It is a super-3 number, since 3×28539831394³ (a number of 32 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7134957847 + ... + 7134957850.

Almost surely, 2^28539831394 is an apocalyptic number.

28539831394 is a deficient number, since it is larger than the sum of its proper divisors (14269915700).

28539831394 is a wasteful number, since it uses less digits than its factorization.

28539831394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14269915699.

The product of its digits is 5598720, while the sum is 55.

The spelling of 28539831394 in words is "twenty-eight billion, five hundred thirty-nine million, eight hundred thirty-one thousand, three hundred ninety-four".