28181315518 has 4 divisors (see below), whose sum is σ = 42271973280. Its totient is φ = 14090657758.

The previous prime is 28181315467. The next prime is 28181315563. The reversal of 28181315518 is 81551318182.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7045328878 + ... + 7045328881.

It is an arithmetic number, because the mean of its divisors is an integer number (10567993320).

Almost surely, 2^28181315518 is an apocalyptic number.

28181315518 is a deficient number, since it is larger than the sum of its proper divisors (14090657762).

28181315518 is a wasteful number, since it uses less digits than its factorization.

28181315518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14090657761.

The product of its digits is 76800, while the sum is 43.

The spelling of 28181315518 in words is "twenty-eight billion, one hundred eighty-one million, three hundred fifteen thousand, five hundred eighteen".