78266039 has 2 divisors, whose sum is σ = 78266040. Its totient is φ = 78266038.

The previous prime is 78266021. The next prime is 78266077. The reversal of 78266039 is 93066287.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78266039 - 2¹² = 78261943 is a prime.

It is a super-2 number, since 2×78266039² = 12251145721499042, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78265987 and 78266005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78266239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39133019 + 39133020.

It is an arithmetic number, because the mean of its divisors is an integer number (39133020).

Almost surely, 2^78266039 is an apocalyptic number.

78266039 is a deficient number, since it is larger than the sum of its proper divisors (1).

78266039 is an equidigital number, since it uses as much as digits as its factorization.

78266039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108864, while the sum is 41.

The square root of 78266039 is about 8846.8095379069. The cubic root of 78266039 is about 427.7510835363.

The spelling of 78266039 in words is "seventy-eight million, two hundred sixty-six thousand, thirty-nine".