18312728807 has 4 divisors (see below), whose sum is σ = 18313041240. Its totient is φ = 18312416376.

The previous prime is 18312728783. The next prime is 18312728839. The reversal of 18312728807 is 70882721381.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70882721381 = 739 ⋅95917079.

It is a cyclic number.

It is not a de Polignac number, because 18312728807 - 2¹⁴ = 18312712423 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 (18312728897) 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, 38957 + ... + 195302.

It is an arithmetic number, because the mean of its divisors is an integer number (4578260310).

Almost surely, 2^18312728807 is an apocalyptic number.

18312728807 is a deficient number, since it is larger than the sum of its proper divisors (312433).

18312728807 is an equidigital number, since it uses as much as digits as its factorization.

18312728807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312432.

The product of its (nonzero) digits is 301056, while the sum is 47.

The spelling of 18312728807 in words is "eighteen billion, three hundred twelve million, seven hundred twenty-eight thousand, eight hundred seven".