78721714 has 4 divisors (see below), whose sum is σ = 118082574. Its totient is φ = 39360856.

The previous prime is 78721697. The next prime is 78721739. The reversal of 78721714 is 41712787.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 41712787 = 89 ⋅468683.

It can be written as a sum of positive squares in only one way, i.e., 46991025 + 31730689 = 6855^2 + 5633^2 .

It is a plaindrome in base 12.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19680427 + ... + 19680430.

Almost surely, 2^78721714 is an apocalyptic number.

78721714 is a deficient number, since it is larger than the sum of its proper divisors (39360860).

78721714 is a wasteful number, since it uses less digits than its factorization.

78721714 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39360859.

The product of its digits is 21952, while the sum is 37.

The square root of 78721714 is about 8872.5257959614. The cubic root of 78721714 is about 428.5796183726.

The spelling of 78721714 in words is "seventy-eight million, seven hundred twenty-one thousand, seven hundred fourteen".