78785989 has 8 divisors (see below), whose sum is σ = 83984000. Its totient is φ = 73693152.

The previous prime is 78785983. The next prime is 78786031. The reversal of 78785989 is 98958787.

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 78785989 - 2³ = 78785981 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 (78785981) 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, 24744 + ... + 27745.

It is an arithmetic number, because the mean of its divisors is an integer number (10498000).

Almost surely, 2^78785989 is an apocalyptic number.

78785989 is a gapful number since it is divisible by the number (79) formed by its first and last digit.

It is an amenable number.

78785989 is a deficient number, since it is larger than the sum of its proper divisors (5198011).

78785989 is a wasteful number, since it uses less digits than its factorization.

78785989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52587.

The product of its digits is 10160640, while the sum is 61.

The square root of 78785989 is about 8876.1471934618. The cubic root of 78785989 is about 428.6962294055.

The spelling of 78785989 in words is "seventy-eight million, seven hundred eighty-five thousand, nine hundred eighty-nine".