78821714 has 4 divisors (see below), whose sum is σ = 118232574. Its totient is φ = 39410856.

The previous prime is 78821669. The next prime is 78821719. The reversal of 78821714 is 41712887.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 41712887 = 31 ⋅1345577.

It can be written as a sum of positive squares in only one way, i.e., 78623689 + 198025 = 8867^2 + 445^2 .

It is not an unprimeable number, because it can be changed into a prime (78821719) 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 as a sum of consecutive naturals, namely, 19705427 + ... + 19705430.

Almost surely, 2^78821714 is an apocalyptic number.

78821714 is a deficient number, since it is larger than the sum of its proper divisors (39410860).

78821714 is a wasteful number, since it uses less digits than its factorization.

78821714 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39410859.

The product of its digits is 25088, while the sum is 38.

The square root of 78821714 is about 8878.1593813132. The cubic root of 78821714 is about 428.7610161302.

The spelling of 78821714 in words is "seventy-eight million, eight hundred twenty-one thousand, seven hundred fourteen".