18728345403 has 12 divisors (see below), whose sum is σ = 27053240760. Its totient is φ = 12485016096.

The previous prime is 18728345399. The next prime is 18728345411. The reversal of 18728345403 is 30454382781.

18728345403 is a `hidden beast` number, since 1 + 8 + 72 + 8 + 34 + 540 + 3 = 666.

It is not a de Polignac number, because 18728345403 - 2² = 18728345399 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18728345453) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 379300 + ... + 425822.

It is an arithmetic number, because the mean of its divisors is an integer number (2254436730).

Almost surely, 2^18728345403 is an apocalyptic number.

18728345403 is a deficient number, since it is larger than the sum of its proper divisors (8324895357).

18728345403 is a wasteful number, since it uses less digits than its factorization.

18728345403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91258 (or 91255 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 45.

The spelling of 18728345403 in words is "eighteen billion, seven hundred twenty-eight million, three hundred forty-five thousand, four hundred three".