18887775396 has 36 divisors (see below), whose sum is σ = 51266820528. Its totient is φ = 5396507088.

The previous prime is 18887775391. The next prime is 18887775427. The reversal of 18887775396 is 69357778881.

It is a self number, because there is not a number n which added to its sum of digits gives 18887775396.

It is not an unprimeable number, because it can be changed into a prime (18887775391) 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, 16060446 + ... + 16061621.

It is an arithmetic number, because the mean of its divisors is an integer number (1424078348).

Almost surely, 2^18887775396 is an apocalyptic number.

It is an amenable number.

18887775396 is an abundant number, since it is smaller than the sum of its proper divisors (32379045132).

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

18887775396 is a wasteful number, since it uses less digits than its factorization.

18887775396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32122088 (or 32122079 counting only the distinct ones).

The product of its digits is 142248960, while the sum is 69.

The spelling of 18887775396 in words is "eighteen billion, eight hundred eighty-seven million, seven hundred seventy-five thousand, three hundred ninety-six".