78713009 has 4 divisors (see below), whose sum is σ = 83343204. Its totient is φ = 74082816.

The previous prime is 78712987. The next prime is 78713027. The reversal of 78713009 is 90031787.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 61465600 + 17247409 = 7840^2 + 4153^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78713009 is a prime.

It is a super-4 number, since 4×78713009⁴ (a number of 33 digits) contains 4444 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78713009.

It is not an unprimeable number, because it can be changed into a prime (78713039) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2315072 + ... + 2315105.

It is an arithmetic number, because the mean of its divisors is an integer number (20835801).

Almost surely, 2^78713009 is an apocalyptic number.

It is an amenable number.

78713009 is a deficient number, since it is larger than the sum of its proper divisors (4630195).

78713009 is a wasteful number, since it uses less digits than its factorization.

78713009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4630194.

The product of its (nonzero) digits is 10584, while the sum is 35.

The square root of 78713009 is about 8872.0352231041. The cubic root of 78713009 is about 428.5638204311.

The spelling of 78713009 in words is "seventy-eight million, seven hundred thirteen thousand, nine".