78864914 has 4 divisors (see below), whose sum is σ = 118297374. Its totient is φ = 39432456.

The previous prime is 78864913. The next prime is 78864917. The reversal of 78864914 is 41946887.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 41946887 = 43 ⋅975509.

It can be written as a sum of positive squares in only one way, i.e., 51480625 + 27384289 = 7175^2 + 5233^2 .

It is not an unprimeable number, because it can be changed into a prime (78864913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19716227 + ... + 19716230.

Almost surely, 2^78864914 is an apocalyptic number.

78864914 is a deficient number, since it is larger than the sum of its proper divisors (39432460).

78864914 is a wasteful number, since it uses less digits than its factorization.

78864914 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39432459.

The product of its digits is 387072, while the sum is 47.

The square root of 78864914 is about 8880.5919847722. The cubic root of 78864914 is about 428.8393325065.

The spelling of 78864914 in words is "seventy-eight million, eight hundred sixty-four thousand, nine hundred fourteen".