78734009 has 4 divisors (see below), whose sum is σ = 79063680. Its totient is φ = 78404340.

The previous prime is 78734003. The next prime is 78734011. The reversal of 78734009 is 90043787.

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 a cyclic number.

It is not a de Polignac number, because 78734009 - 2¹² = 78729913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78734003) 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, 164477 + ... + 164954.

It is an arithmetic number, because the mean of its divisors is an integer number (19765920).

Almost surely, 2^78734009 is an apocalyptic number.

It is an amenable number.

78734009 is a deficient number, since it is larger than the sum of its proper divisors (329671).

78734009 is a wasteful number, since it uses less digits than its factorization.

78734009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329670.

The product of its (nonzero) digits is 42336, while the sum is 38.

The square root of 78734009 is about 8873.2186381268. The cubic root of 78734009 is about 428.6019295065.

The spelling of 78734009 in words is "seventy-eight million, seven hundred thirty-four thousand, nine".