78866479 has 2 divisors, whose sum is σ = 78866480. Its totient is φ = 78866478.

The previous prime is 78866461. The next prime is 78866503. The reversal of 78866479 is 97466887.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78866479 - 2¹⁹ = 78342191 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78866419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39433239 + 39433240.

It is an arithmetic number, because the mean of its divisors is an integer number (39433240).

Almost surely, 2^78866479 is an apocalyptic number.

78866479 is a deficient number, since it is larger than the sum of its proper divisors (1).

78866479 is an equidigital number, since it uses as much as digits as its factorization.

78866479 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 78866479 is about 8880.6800978303. The cubic root of 78866479 is about 428.8421691254.

It can be divided in two parts, 7886 and 6479, that added together give a triangular number (14365 = T₁₆₉).

The spelling of 78866479 in words is "seventy-eight million, eight hundred sixty-six thousand, four hundred seventy-nine".