78139067 has 2 divisors, whose sum is σ = 78139068. Its totient is φ = 78139066.

The previous prime is 78139043. The next prime is 78139091. The reversal of 78139067 is 76093187.

It is a balanced prime because it is at equal distance from previous prime (78139043) and next prime (78139091).

It is a cyclic number.

It is not a de Polignac number, because 78139067 - 2¹⁸ = 77876923 is a prime.

It is a super-2 number, since 2×78139067² = 12211427583260978, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78139037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39069533 + 39069534.

It is an arithmetic number, because the mean of its divisors is an integer number (39069534).

Almost surely, 2^78139067 is an apocalyptic number.

78139067 is a deficient number, since it is larger than the sum of its proper divisors (1).

78139067 is an equidigital number, since it uses as much as digits as its factorization.

78139067 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 63504, while the sum is 41.

The square root of 78139067 is about 8839.6304787021. The cubic root of 78139067 is about 427.5196429764.

The spelling of 78139067 in words is "seventy-eight million, one hundred thirty-nine thousand, sixty-seven".