88988989 has 4 divisors (see below), whose sum is σ = 93672640. Its totient is φ = 84305340.

The previous prime is 88988987. The next prime is 88989007. The reversal of 88988989 is 98988988.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 88988989 - 2¹ = 88988987 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (88988987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2341797 + ... + 2341834.

It is an arithmetic number, because the mean of its divisors is an integer number (23418160).

Almost surely, 2^88988989 is an apocalyptic number.

It is an amenable number.

88988989 is a deficient number, since it is larger than the sum of its proper divisors (4683651).

88988989 is a wasteful number, since it uses less digits than its factorization.

88988989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4683650.

The product of its digits is 23887872, while the sum is 67.

The square root of 88988989 is about 9433.3975321726. The cubic root of 88988989 is about 446.4560963241.

Subtracting 88988989 from its reverse (98988988), we obtain a palindrome (9999999).

The spelling of 88988989 in words is "eighty-eight million, nine hundred eighty-eight thousand, nine hundred eighty-nine".