78630071 has 4 divisors (see below), whose sum is σ = 84678552. Its totient is φ = 72581592.

The previous prime is 78630053. The next prime is 78630089. The reversal of 78630071 is 17003687.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (78630053) and next prime (78630089).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78630071 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 (78630001) 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 3 ways as a sum of consecutive naturals, for example, 3024221 + ... + 3024246.

It is an arithmetic number, because the mean of its divisors is an integer number (21169638).

Almost surely, 2^78630071 is an apocalyptic number.

78630071 is a deficient number, since it is larger than the sum of its proper divisors (6048481).

78630071 is a wasteful number, since it uses less digits than its factorization.

78630071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6048480.

The product of its (nonzero) digits is 7056, while the sum is 32.

The square root of 78630071 is about 8867.3598663864. The cubic root of 78630071 is about 428.4132450775.

The spelling of 78630071 in words is "seventy-eight million, six hundred thirty thousand, seventy-one".