78607989 has 10 divisors (see below), whose sum is σ = 117426870. Its totient is φ = 52405272.

The previous prime is 78607981. The next prime is 78607993. The reversal of 78607989 is 98970687.

It can be written as a sum of positive squares in only one way, i.e., 67519089 + 11088900 = 8217^2 + 3330^2 .

It is not a de Polignac number, because 78607989 - 2³ = 78607981 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78607981) 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 9 ways as a sum of consecutive naturals, for example, 485154 + ... + 485315.

It is an arithmetic number, because the mean of its divisors is an integer number (11742687).

Almost surely, 2^78607989 is an apocalyptic number.

It is an amenable number.

78607989 is a deficient number, since it is larger than the sum of its proper divisors (38818881).

78607989 is an equidigital number, since it uses as much as digits as its factorization.

78607989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 970481 (or 970472 counting only the distinct ones).

The product of its (nonzero) digits is 1524096, while the sum is 54.

The square root of 78607989 is about 8866.1146507363. The cubic root of 78607989 is about 428.3731369828.

The spelling of 78607989 in words is "seventy-eight million, six hundred seven thousand, nine hundred eighty-nine".