78426687 has 8 divisors (see below), whose sum is σ = 105367680. Its totient is φ = 51885080.

The previous prime is 78426659. The next prime is 78426713. The reversal of 78426687 is 78662487.

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

It is a cyclic number.

It is not a de Polignac number, because 78426687 - 2¹⁰ = 78425663 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78426637) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 99387 + ... + 100172.

It is an arithmetic number, because the mean of its divisors is an integer number (13170960).

Almost surely, 2^78426687 is an apocalyptic number.

78426687 is a deficient number, since it is larger than the sum of its proper divisors (26940993).

78426687 is a wasteful number, since it uses less digits than its factorization.

78426687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199693.

The product of its digits is 903168, while the sum is 48.

The square root of 78426687 is about 8855.8843149626. The cubic root of 78426687 is about 428.0435492269.

The spelling of 78426687 in words is "seventy-eight million, four hundred twenty-six thousand, six hundred eighty-seven".