78464039 has 2 divisors, whose sum is σ = 78464040. Its totient is φ = 78464038.

The previous prime is 78463999. The next prime is 78464051. The reversal of 78464039 is 93046487.

It is a strong prime.

It is an emirp because it is prime and its reverse (93046487) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78464039 - 2⁸ = 78463783 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 78463987 and 78464005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78464059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39232019 + 39232020.

It is an arithmetic number, because the mean of its divisors is an integer number (39232020).

Almost surely, 2^78464039 is an apocalyptic number.

78464039 is a deficient number, since it is larger than the sum of its proper divisors (1).

78464039 is an equidigital number, since it uses as much as digits as its factorization.

78464039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 41.

The square root of 78464039 is about 8857.9929442284. The cubic root of 78464039 is about 428.1114927026. Note that the first 3 decimals are identical.

The spelling of 78464039 in words is "seventy-eight million, four hundred sixty-four thousand, thirty-nine".