78748279 has 2 divisors, whose sum is σ = 78748280. Its totient is φ = 78748278.

The previous prime is 78748261. The next prime is 78748289. The reversal of 78748279 is 97284787.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78748279 - 2⁷ = 78748151 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78748289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39374139 + 39374140.

It is an arithmetic number, because the mean of its divisors is an integer number (39374140).

Almost surely, 2^78748279 is an apocalyptic number.

78748279 is a deficient number, since it is larger than the sum of its proper divisors (1).

78748279 is an equidigital number, since it uses as much as digits as its factorization.

78748279 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1580544, while the sum is 52.

The square root of 78748279 is about 8874.0227067548. The cubic root of 78748279 is about 428.6278216639.

The spelling of 78748279 in words is "seventy-eight million, seven hundred forty-eight thousand, two hundred seventy-nine".