78102109 has 8 divisors (see below), whose sum is σ = 80016768. Its totient is φ = 76198080.

The previous prime is 78102107. The next prime is 78102121. The reversal of 78102109 is 90120187.

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 78102109 - 2¹ = 78102107 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 (78102107) 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 7 ways as a sum of consecutive naturals, for example, 13374 + ... + 18304.

It is an arithmetic number, because the mean of its divisors is an integer number (10002096).

Almost surely, 2^78102109 is an apocalyptic number.

It is an amenable number.

78102109 is a deficient number, since it is larger than the sum of its proper divisors (1914659).

78102109 is a wasteful number, since it uses less digits than its factorization.

78102109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5315.

The product of its (nonzero) digits is 1008, while the sum is 28.

The square root of 78102109 is about 8837.5397594579. The cubic root of 78102109 is about 427.4522299939.

The spelling of 78102109 in words is "seventy-eight million, one hundred two thousand, one hundred nine".