78590279 has 2 divisors, whose sum is σ = 78590280. Its totient is φ = 78590278.

The previous prime is 78590249. The next prime is 78590297. The reversal of 78590279 is 97209587.

Together with next prime (78590297) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78590279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78590249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39295139 + 39295140.

It is an arithmetic number, because the mean of its divisors is an integer number (39295140).

Almost surely, 2^78590279 is an apocalyptic number.

78590279 is a deficient number, since it is larger than the sum of its proper divisors (1).

78590279 is an equidigital number, since it uses as much as digits as its factorization.

78590279 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 317520, while the sum is 47.

The square root of 78590279 is about 8865.1158480868. The cubic root of 78590279 is about 428.3409644341.

The spelling of 78590279 in words is "seventy-eight million, five hundred ninety thousand, two hundred seventy-nine".