78704641 has 4 divisors (see below), whose sum is σ = 78730452. Its totient is φ = 78678832.

The previous prime is 78704623. The next prime is 78704677. The reversal of 78704641 is 14640787.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 65044225 + 13660416 = 8065^2 + 3696^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78704641 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 78704641.

It is not an unprimeable number, because it can be changed into a prime (78704741) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7606 + ... + 14671.

It is an arithmetic number, because the mean of its divisors is an integer number (19682613).

Almost surely, 2^78704641 is an apocalyptic number.

It is an amenable number.

78704641 is a deficient number, since it is larger than the sum of its proper divisors (25811).

78704641 is a wasteful number, since it uses less digits than its factorization.

78704641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25810.

The product of its (nonzero) digits is 37632, while the sum is 37.

The square root of 78704641 is about 8871.5636164095. The cubic root of 78704641 is about 428.5486329833.

The spelling of 78704641 in words is "seventy-eight million, seven hundred four thousand, six hundred forty-one".