78809438 has 8 divisors (see below), whose sum is σ = 120152280. Its totient is φ = 38758680.

The previous prime is 78809429. The next prime is 78809441. The reversal of 78809438 is 83490887.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 78809392 and 78809401.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 322868 + ... + 323111.

It is an arithmetic number, because the mean of its divisors is an integer number (15019035).

Almost surely, 2^78809438 is an apocalyptic number.

78809438 is a deficient number, since it is larger than the sum of its proper divisors (41342842).

78809438 is a wasteful number, since it uses less digits than its factorization.

78809438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 646042.

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

The square root of 78809438 is about 8877.4679948733. The cubic root of 78809438 is about 428.7387560056.

The spelling of 78809438 in words is "seventy-eight million, eight hundred nine thousand, four hundred thirty-eight".