28131421516 has 24 divisors (see below), whose sum is σ = 53711307216. Its totient is φ = 12785613120.

The previous prime is 28131421511. The next prime is 28131421519. The reversal of 28131421516 is 61512413182.

It is not an unprimeable number, because it can be changed into a prime (28131421511) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 447330 + ... + 506326.

It is an arithmetic number, because the mean of its divisors is an integer number (2237971134).

Almost surely, 2^28131421516 is an apocalyptic number.

It is an amenable number.

28131421516 is a deficient number, since it is larger than the sum of its proper divisors (25579885700).

28131421516 is a wasteful number, since it uses less digits than its factorization.

28131421516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69849 (or 69847 counting only the distinct ones).

The product of its digits is 11520, while the sum is 34.

Adding to 28131421516 its reverse (61512413182), we get a palindrome (89643834698).

The spelling of 28131421516 in words is "twenty-eight billion, one hundred thirty-one million, four hundred twenty-one thousand, five hundred sixteen".