87328989 has 32 divisors (see below), whose sum is σ = 141772800. Its totient is φ = 52688880.

The previous prime is 87328987. The next prime is 87329041. The reversal of 87328989 is 98982378.

It is not a de Polignac number, because 87328989 - 2¹ = 87328987 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87328987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 83532 + ... + 84570.

It is an arithmetic number, because the mean of its divisors is an integer number (4430400).

Almost surely, 2^87328989 is an apocalyptic number.

It is an amenable number.

87328989 is a deficient number, since it is larger than the sum of its proper divisors (54443811).

87328989 is a wasteful number, since it uses less digits than its factorization.

87328989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1342 (or 1336 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 54.

The square root of 87328989 is about 9344.9980738361. The cubic root of 87328989 is about 443.6625906257.

It can be divided in two parts, 873289 and 89, that added together give a palindrome (873378).

The spelling of 87328989 in words is "eighty-seven million, three hundred twenty-eight thousand, nine hundred eighty-nine".