18888888 has 64 divisors (see below), whose sum is σ = 51897600. Its totient is φ = 5702400.

The previous prime is 18888871. The next prime is 18888913. The reversal of 18888888 is 88888881.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a nude number because it is divisible by every one of its digits.

18888888 is a modest number, since divided by 8888 gives 1888 as remainder.

It is a plaindrome in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9588 + ... + 11388.

It is an arithmetic number, because the mean of its divisors is an integer number (810900).

Almost surely, 2^18888888 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18888888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25948800).

18888888 is an abundant number, since it is smaller than the sum of its proper divisors (33008712).

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

18888888 is a wasteful number, since it uses less digits than its factorization.

18888888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1852 (or 1848 counting only the distinct ones).

The product of its digits is 2097152, while the sum is 57.

The square root of 18888888 is about 4346.1348345398. The cubic root of 18888888 is about 266.3189871709.

The spelling of 18888888 in words is "eighteen million, eight hundred eighty-eight thousand, eight hundred eighty-eight".