78718705 has 8 divisors (see below), whose sum is σ = 101728872. Its totient is φ = 58130688.

The previous prime is 78718699. The next prime is 78718709. The reversal of 78718705 is 50781787.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 5239521 + 73479184 = 2289^2 + 8572^2 .

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 78718705 - 2³ = 78718697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78718709) 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 7 ways as a sum of consecutive naturals, for example, 605464 + ... + 605593.

It is an arithmetic number, because the mean of its divisors is an integer number (12716109).

Almost surely, 2^78718705 is an apocalyptic number.

It is an amenable number.

78718705 is a deficient number, since it is larger than the sum of its proper divisors (23010167).

78718705 is a wasteful number, since it uses less digits than its factorization.

78718705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1211075.

The product of its (nonzero) digits is 109760, while the sum is 43.

The square root of 78718705 is about 8872.3562259413. The cubic root of 78718705 is about 428.5741577339.

The spelling of 78718705 in words is "seventy-eight million, seven hundred eighteen thousand, seven hundred five".