78814709 has 8 divisors (see below), whose sum is σ = 79664640. Its totient is φ = 77968800.

The previous prime is 78814693. The next prime is 78814733. The reversal of 78814709 is 90741887.

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 78814709 - 2⁴ = 78814693 is a prime.

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 78814709.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78814789) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52844 + ... + 54314.

It is an arithmetic number, because the mean of its divisors is an integer number (9958080).

Almost surely, 2^78814709 is an apocalyptic number.

It is an amenable number.

78814709 is a deficient number, since it is larger than the sum of its proper divisors (849931).

78814709 is a wasteful number, since it uses less digits than its factorization.

78814709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2011.

The product of its (nonzero) digits is 112896, while the sum is 44.

The square root of 78814709 is about 8877.7648650998. The cubic root of 78814709 is about 428.7483142162.

The spelling of 78814709 in words is "seventy-eight million, eight hundred fourteen thousand, seven hundred nine".