78729379 has 4 divisors (see below), whose sum is σ = 79304184. Its totient is φ = 78154576.

The previous prime is 78729373. The next prime is 78729419. The reversal of 78729379 is 97392787.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97392787 = 23 ⋅4234469.

It is a cyclic number.

It is not a de Polignac number, because 78729379 - 2²³ = 70340771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78729373) 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 in 3 ways as a sum of consecutive naturals, for example, 287197 + ... + 287470.

It is an arithmetic number, because the mean of its divisors is an integer number (19826046).

Almost surely, 2^78729379 is an apocalyptic number.

78729379 is a deficient number, since it is larger than the sum of its proper divisors (574805).

78729379 is a wasteful number, since it uses less digits than its factorization.

78729379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 574804.

The product of its digits is 1333584, while the sum is 52.

The square root of 78729379 is about 8872.9577368542. The cubic root of 78729379 is about 428.5935279451.

The spelling of 78729379 in words is "seventy-eight million, seven hundred twenty-nine thousand, three hundred seventy-nine".