78832391 has 4 divisors (see below), whose sum is σ = 85998984. Its totient is φ = 71665800.

The previous prime is 78832367. The next prime is 78832423. The reversal of 78832391 is 19323887.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 78832391 - 2¹⁴ = 78816007 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78832331) 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 in 3 ways as a sum of consecutive naturals, for example, 3583280 + ... + 3583301.

It is an arithmetic number, because the mean of its divisors is an integer number (21499746).

Almost surely, 2^78832391 is an apocalyptic number.

78832391 is a deficient number, since it is larger than the sum of its proper divisors (7166593).

78832391 is a wasteful number, since it uses less digits than its factorization.

78832391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7166592.

The product of its digits is 72576, while the sum is 41.

The square root of 78832391 is about 8878.7606680212. The cubic root of 78832391 is about 428.7803749018.

The spelling of 78832391 in words is "seventy-eight million, eight hundred thirty-two thousand, three hundred ninety-one".