78458279 has 2 divisors, whose sum is σ = 78458280. Its totient is φ = 78458278.

The previous prime is 78458249. The next prime is 78458287. The reversal of 78458279 is 97285487.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78458279 - 2¹² = 78454183 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78458209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39229139 + 39229140.

It is an arithmetic number, because the mean of its divisors is an integer number (39229140).

Almost surely, 2^78458279 is an apocalyptic number.

78458279 is a deficient number, since it is larger than the sum of its proper divisors (1).

78458279 is an equidigital number, since it uses as much as digits as its factorization.

78458279 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1128960, while the sum is 50.

The square root of 78458279 is about 8857.6678081761. The cubic root of 78458279 is about 428.1010166400.

The spelling of 78458279 in words is "seventy-eight million, four hundred fifty-eight thousand, two hundred seventy-nine".