78665714 has 4 divisors (see below), whose sum is σ = 117998574. Its totient is φ = 39332856.

The previous prime is 78665707. The next prime is 78665753. The reversal of 78665714 is 41756687.

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

It can be written as a sum of positive squares in only one way, i.e., 78623689 + 42025 = 8867^2 + 205^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19666427 + ... + 19666430.

Almost surely, 2^78665714 is an apocalyptic number.

78665714 is a deficient number, since it is larger than the sum of its proper divisors (39332860).

78665714 is a wasteful number, since it uses less digits than its factorization.

78665714 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39332859.

The product of its digits is 282240, while the sum is 44.

The square root of 78665714 is about 8869.3694251621. The cubic root of 78665714 is about 428.4779685198.

The spelling of 78665714 in words is "seventy-eight million, six hundred sixty-five thousand, seven hundred fourteen".