18739036128 has 48 divisors (see below), whose sum is σ = 49277483136. Its totient is φ = 6235232640.

The previous prime is 18739036117. The next prime is 18739036163. The reversal of 18739036128 is 82163093781.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

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, 119308 + ... + 227403.

It is an arithmetic number, because the mean of its divisors is an integer number (1026614232).

Almost surely, 2^18739036128 is an apocalyptic number.

It is an amenable number.

18739036128 is an abundant number, since it is smaller than the sum of its proper divisors (30538447008).

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

18739036128 is a wasteful number, since it uses less digits than its factorization.

18739036128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347287 (or 347279 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 48.

The spelling of 18739036128 in words is "eighteen billion, seven hundred thirty-nine million, thirty-six thousand, one hundred twenty-eight".