78647209409 has 8 divisors (see below), whose sum is σ = 83920599840. Its totient is φ = 73487225376.

The previous prime is 78647209369. The next prime is 78647209427. The reversal of 78647209409 is 90490274687.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 78647209409 - 2⁸ = 78647209153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78647209499) 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, 28350167 + ... + 28352940.

It is an arithmetic number, because the mean of its divisors is an integer number (10490074980).

Almost surely, 2^78647209409 is an apocalyptic number.

It is an amenable number.

78647209409 is a deficient number, since it is larger than the sum of its proper divisors (5273390431).

78647209409 is a wasteful number, since it uses less digits than its factorization.

78647209409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56703199.

The product of its (nonzero) digits is 6096384, while the sum is 56.

The spelling of 78647209409 in words is "seventy-eight billion, six hundred forty-seven million, two hundred nine thousand, four hundred nine".