89999999999 has 64 divisors (see below), whose sum is σ = 120072056832. Its totient is φ = 65434521600.

The previous prime is 89999999993. The next prime is 90000000019. The reversal of 89999999999 is 99999999998.

It is a happy number.

It is a Cunningham number, because it is equal to 300000²-1.

It is not a de Polignac number, because 89999999999 - 2²⁸ = 89731564543 is a prime.

It is a super-9 number, since 9×89999999999⁹ (a number of 100 digits) contains 999999999 as substring.

89999999999 is a modest number, since divided by 999999 gives 89999 as remainder.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (89999999993) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 35698859 + ... + 35701379.

It is an arithmetic number, because the mean of its divisors is an integer number (1876125888).

Almost surely, 2^89999999999 is an apocalyptic number.

89999999999 is a deficient number, since it is larger than the sum of its proper divisors (30072056833).

89999999999 is a wasteful number, since it uses less digits than its factorization.

89999999999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3096.

The product of its digits is 27894275208, while the sum is 98.

Subtracting 89999999999 from its reverse (99999999998), we obtain a palindrome (9999999999).

The spelling of 89999999999 in words is "eighty-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-nine".