78464279 has 2 divisors, whose sum is σ = 78464280. Its totient is φ = 78464278.

The previous prime is 78464273. The next prime is 78464329. The reversal of 78464279 is 97246487.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78464279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78464273) 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 as a sum of consecutive naturals, namely, 39232139 + 39232140.

It is an arithmetic number, because the mean of its divisors is an integer number (39232140).

Almost surely, 2^78464279 is an apocalyptic number.

78464279 is a deficient number, since it is larger than the sum of its proper divisors (1).

78464279 is an equidigital number, since it uses as much as digits as its factorization.

78464279 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 677376, while the sum is 47.

The square root of 78464279 is about 8858.0064913049. The cubic root of 78464279 is about 428.1119291941. Note that the first 3 decimals are identical.

The spelling of 78464279 in words is "seventy-eight million, four hundred sixty-four thousand, two hundred seventy-nine".