18910728315 has 32 divisors (see below), whose sum is σ = 33694056000. Its totient is φ = 10063226880.

The previous prime is 18910728307. The next prime is 18910728337. The reversal of 18910728315 is 51382701981.

It is not a de Polignac number, because 18910728315 - 2³ = 18910728307 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 95376 + ... + 216605.

It is an arithmetic number, because the mean of its divisors is an integer number (1052939250).

Almost surely, 2^18910728315 is an apocalyptic number.

18910728315 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18910728315 is a deficient number, since it is larger than the sum of its proper divisors (14783327685).

18910728315 is a wasteful number, since it uses less digits than its factorization.

18910728315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312444 (or 312438 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 45.

The spelling of 18910728315 in words is "eighteen billion, nine hundred ten million, seven hundred twenty-eight thousand, three hundred fifteen".