78855829 has 8 divisors (see below), whose sum is σ = 84991032. Its totient is φ = 72730560.

The previous prime is 78855827. The next prime is 78855839. The reversal of 78855829 is 92855887.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 14455204 + 64400625 = 3802^2 + 8025^2 .

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 78855829 - 2¹ = 78855827 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 (78855827) 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, 27399 + ... + 30139.

It is an arithmetic number, because the mean of its divisors is an integer number (10623879).

Almost surely, 2^78855829 is an apocalyptic number.

It is an amenable number.

78855829 is a deficient number, since it is larger than the sum of its proper divisors (6135203).

78855829 is a wasteful number, since it uses less digits than its factorization.

78855829 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4967.

The product of its digits is 1612800, while the sum is 52.

The square root of 78855829 is about 8880.0804613472. The cubic root of 78855829 is about 428.8228648753.

The spelling of 78855829 in words is "seventy-eight million, eight hundred fifty-five thousand, eight hundred twenty-nine".