1988888890 has 32 divisors (see below), whose sum is σ = 3822546816. Its totient is φ = 743265600.

The previous prime is 1988888857. The next prime is 1988888899. The reversal of 1988888890 is 988888891.

It is not an unprimeable number, because it can be changed into a prime (1988888899) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90661 + ... + 110440.

It is an arithmetic number, because the mean of its divisors is an integer number (119454588).

Almost surely, 2^1988888890 is an apocalyptic number.

1988888890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1988888890 is a deficient number, since it is larger than the sum of its proper divisors (1833657926).

1988888890 is a wasteful number, since it uses less digits than its factorization.

1988888890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201174.

The product of its (nonzero) digits is 21233664, while the sum is 67.

The square root of 1988888890 is about 44596.9605466561. The cubic root of 1988888890 is about 1257.5835288976.

Subtracting from 1988888890 its reverse (988888891), we obtain a palindrome (999999999).

The spelling of 1988888890 in words is "one billion, nine hundred eighty-eight million, eight hundred eighty-eight thousand, eight hundred ninety".