78668439 has 16 divisors (see below), whose sum is σ = 105974400. Its totient is φ = 51907680.

The previous prime is 78668423. The next prime is 78668477. The reversal of 78668439 is 93486687.

It is not a de Polignac number, because 78668439 - 2⁴ = 78668423 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 78668391 and 78668400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78668419) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 225237 + ... + 225585.

It is an arithmetic number, because the mean of its divisors is an integer number (6623400).

Almost surely, 2^78668439 is an apocalyptic number.

78668439 is a deficient number, since it is larger than the sum of its proper divisors (27305961).

78668439 is a wasteful number, since it uses less digits than its factorization.

78668439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 910.

The product of its digits is 1741824, while the sum is 51.

The square root of 78668439 is about 8869.5230424189. The cubic root of 78668439 is about 428.4829159907.

The spelling of 78668439 in words is "seventy-eight million, six hundred sixty-eight thousand, four hundred thirty-nine".