78290009 has 4 divisors (see below), whose sum is σ = 89474304. Its totient is φ = 67105716.

The previous prime is 78289997. The next prime is 78290021. The reversal of 78290009 is 90009287.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (78289997) and next prime (78290021).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78290009 is a prime.

It is a super-2 number, since 2×78290009² = 12258651018440162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78290099) 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 3 ways as a sum of consecutive naturals, for example, 5592137 + ... + 5592150.

It is an arithmetic number, because the mean of its divisors is an integer number (22368576).

Almost surely, 2^78290009 is an apocalyptic number.

It is an amenable number.

78290009 is a deficient number, since it is larger than the sum of its proper divisors (11184295).

78290009 is a wasteful number, since it uses less digits than its factorization.

78290009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11184294.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 78290009 is about 8848.1641598695. The cubic root of 78290009 is about 427.7947472039.

The spelling of 78290009 in words is "seventy-eight million, two hundred ninety thousand, nine".