28129315439 has 4 divisors (see below), whose sum is σ = 28135682520. Its totient is φ = 28122948360.

The previous prime is 28129315433. The next prime is 28129315447. The reversal of 28129315439 is 93451392182.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28129315439 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28129315393 and 28129315402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28129315433) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3176909 + ... + 3185750.

It is an arithmetic number, because the mean of its divisors is an integer number (7033920630).

Almost surely, 2^28129315439 is an apocalyptic number.

28129315439 is a deficient number, since it is larger than the sum of its proper divisors (6367081).

28129315439 is an equidigital number, since it uses as much as digits as its factorization.

28129315439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6367080.

The product of its digits is 466560, while the sum is 47.

The spelling of 28129315439 in words is "twenty-eight billion, one hundred twenty-nine million, three hundred fifteen thousand, four hundred thirty-nine".