78152279 has 2 divisors, whose sum is σ = 78152280. Its totient is φ = 78152278.

The previous prime is 78152257. The next prime is 78152287. The reversal of 78152279 is 97225187.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78152279 - 2¹² = 78148183 is a prime.

It is a super-2 number, since 2×78152279² = 12215557425787682, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78152579) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39076139 + 39076140.

It is an arithmetic number, because the mean of its divisors is an integer number (39076140).

Almost surely, 2^78152279 is an apocalyptic number.

78152279 is a deficient number, since it is larger than the sum of its proper divisors (1).

78152279 is an equidigital number, since it uses as much as digits as its factorization.

78152279 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 70560, while the sum is 41.

The square root of 78152279 is about 8840.3777634217. The cubic root of 78152279 is about 427.5437370753.

The spelling of 78152279 in words is "seventy-eight million, one hundred fifty-two thousand, two hundred seventy-nine".