18729455368 has 32 divisors (see below), whose sum is σ = 37866711960. Its totient is φ = 8633479680.

The previous prime is 18729455351. The next prime is 18729455399. The reversal of 18729455368 is 86355492781.

It can be written as a sum of positive squares in 4 ways, for example, as 6744022884 + 11985432484 = 82122^2 + 109478^2 .

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30093 + ... + 195868.

Almost surely, 2^18729455368 is an apocalyptic number.

It is an amenable number.

18729455368 is an abundant number, since it is smaller than the sum of its proper divisors (19137256592).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18729455368 is a wasteful number, since it uses less digits than its factorization.

18729455368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226777 (or 226773 counting only the distinct ones).

The product of its digits is 14515200, while the sum is 58.

The spelling of 18729455368 in words is "eighteen billion, seven hundred twenty-nine million, four hundred fifty-five thousand, three hundred sixty-eight".