28969124447 has 4 divisors (see below), whose sum is σ = 28999910856. Its totient is φ = 28938338040.

The previous prime is 28969124441. The next prime is 28969124461. The reversal of 28969124447 is 74442196982.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 28969124447 - 2²² = 28964930143 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28969124392 and 28969124401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28969124441) 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, 15391793 + ... + 15393674.

It is an arithmetic number, because the mean of its divisors is an integer number (7249977714).

Almost surely, 2^28969124447 is an apocalyptic number.

28969124447 is a deficient number, since it is larger than the sum of its proper divisors (30786409).

28969124447 is an equidigital number, since it uses as much as digits as its factorization.

28969124447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30786408.

The product of its digits is 6967296, while the sum is 56.

The spelling of 28969124447 in words is "twenty-eight billion, nine hundred sixty-nine million, one hundred twenty-four thousand, four hundred forty-seven".