78447068279 has 4 divisors (see below), whose sum is σ = 78456341784. Its totient is φ = 78437794776.

The previous prime is 78447068269. The next prime is 78447068281. The reversal of 78447068279 is 97286074487.

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 78447068279 - 2⁴ = 78447068263 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 (78447068209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4624052 + ... + 4640985.

It is an arithmetic number, because the mean of its divisors is an integer number (19614085446).

Almost surely, 2^78447068279 is an apocalyptic number.

78447068279 is a deficient number, since it is larger than the sum of its proper divisors (9273505).

78447068279 is an equidigital number, since it uses as much as digits as its factorization.

78447068279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9273504.

The product of its (nonzero) digits is 37933056, while the sum is 62.

The spelling of 78447068279 in words is "seventy-eight billion, four hundred forty-seven million, sixty-eight thousand, two hundred seventy-nine".