78686479 has 2 divisors, whose sum is σ = 78686480. Its totient is φ = 78686478.

The previous prime is 78686459. The next prime is 78686501. The reversal of 78686479 is 97468687.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78686479 - 2¹³ = 78678287 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78686459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39343239 + 39343240.

It is an arithmetic number, because the mean of its divisors is an integer number (39343240).

Almost surely, 2^78686479 is an apocalyptic number.

78686479 is a deficient number, since it is larger than the sum of its proper divisors (1).

78686479 is an equidigital number, since it uses as much as digits as its factorization.

78686479 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4064256, while the sum is 55.

The square root of 78686479 is about 8870.5399497438. The cubic root of 78686479 is about 428.5156662741.

The spelling of 78686479 in words is "seventy-eight million, six hundred eighty-six thousand, four hundred seventy-nine".