78008989 has 8 divisors (see below), whose sum is σ = 80644608. Its totient is φ = 75380880.

The previous prime is 78008981. The next prime is 78008993. The reversal of 78008989 is 98980087.

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 78008989 - 2³ = 78008981 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 (78008981) 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 7 ways as a sum of consecutive naturals, for example, 26079 + ... + 28915.

It is an arithmetic number, because the mean of its divisors is an integer number (10080576).

Almost surely, 2^78008989 is an apocalyptic number.

It is an amenable number.

78008989 is a deficient number, since it is larger than the sum of its proper divisors (2635619).

78008989 is a wasteful number, since it uses less digits than its factorization.

78008989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3755.

The product of its (nonzero) digits is 290304, while the sum is 49.

The square root of 78008989 is about 8832.2697535798. The cubic root of 78008989 is about 427.2822807568.

The spelling of 78008989 in words is "seventy-eight million, eight thousand, nine hundred eighty-nine".