28912046813 has 4 divisors (see below), whose sum is σ = 31136050428. Its totient is φ = 26688043200.

The previous prime is 28912046797. The next prime is 28912046819. The reversal of 28912046813 is 31864021982.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 11942555524 + 16969491289 = 109282^2 + 130267^2 .

It is not a de Polignac number, because 28912046813 - 2⁴ = 28912046797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28912046819) 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, 1112001788 + ... + 1112001813.

It is an arithmetic number, because the mean of its divisors is an integer number (7784012607).

Almost surely, 2^28912046813 is an apocalyptic number.

It is an amenable number.

28912046813 is a deficient number, since it is larger than the sum of its proper divisors (2224003615).

28912046813 is a wasteful number, since it uses less digits than its factorization.

28912046813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2224003614.

The product of its (nonzero) digits is 165888, while the sum is 44.

The spelling of 28912046813 in words is "twenty-eight billion, nine hundred twelve million, forty-six thousand, eight hundred thirteen".