87929989 has 8 divisors (see below), whose sum is σ = 104860800. Its totient is φ = 72091536.

The previous prime is 87929987. The next prime is 87930047. The reversal of 87929989 is 98992978.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 87929989 - 2¹ = 87929987 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 (87929983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 272914 + ... + 273235.

It is an arithmetic number, because the mean of its divisors is an integer number (13107600).

Almost surely, 2^87929989 is an apocalyptic number.

It is an amenable number.

87929989 is a deficient number, since it is larger than the sum of its proper divisors (16930811).

87929989 is a wasteful number, since it uses less digits than its factorization.

87929989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 546179.

The product of its digits is 5878656, while the sum is 61.

The square root of 87929989 is about 9377.0991783174. The cubic root of 87929989 is about 444.6780299474.

It can be divided in two parts, 8792 and 9989, that added together give a palindrome (18781).

The spelling of 87929989 in words is "eighty-seven million, nine hundred twenty-nine thousand, nine hundred eighty-nine".