78827851 has 4 divisors (see below), whose sum is σ = 78858832. Its totient is φ = 78796872.

The previous prime is 78827843. The next prime is 78827867. The reversal of 78827851 is 15872887.

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: 15872887 = 47 ⋅337721.

It is a cyclic number.

It is not a de Polignac number, because 78827851 - 2³ = 78827843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78827251) 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, 11295 + ... + 16888.

It is an arithmetic number, because the mean of its divisors is an integer number (19714708).

Almost surely, 2^78827851 is an apocalyptic number.

78827851 is a deficient number, since it is larger than the sum of its proper divisors (30981).

78827851 is a wasteful number, since it uses less digits than its factorization.

78827851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30980.

The product of its digits is 250880, while the sum is 46.

The square root of 78827851 is about 8878.5049980275. The cubic root of 78827851 is about 428.7721435126.

The spelling of 78827851 in words is "seventy-eight million, eight hundred twenty-seven thousand, eight hundred fifty-one".