18728365829 has 4 divisors (see below), whose sum is σ = 19081731276. Its totient is φ = 18375000384.

The previous prime is 18728365819. The next prime is 18728365849. The reversal of 18728365829 is 92856382781.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 92856382781 = 173 ⋅536742097.

It can be written as a sum of positive squares in 2 ways, for example, as 4969545025 + 13758820804 = 70495^2 + 117298^2 .

It is a cyclic number.

It is not a de Polignac number, because 18728365829 - 2²⁰ = 18727317253 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 (18728365819) 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, 176682644 + ... + 176682749.

It is an arithmetic number, because the mean of its divisors is an integer number (4770432819).

Almost surely, 2^18728365829 is an apocalyptic number.

It is an amenable number.

18728365829 is a deficient number, since it is larger than the sum of its proper divisors (353365447).

18728365829 is an equidigital number, since it uses as much as digits as its factorization.

18728365829 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 353365446.

The product of its digits is 11612160, while the sum is 59.

The spelling of 18728365829 in words is "eighteen billion, seven hundred twenty-eight million, three hundred sixty-five thousand, eight hundred twenty-nine".