78577139 has 2 divisors, whose sum is σ = 78577140. Its totient is φ = 78577138.

The previous prime is 78577133. The next prime is 78577171. The reversal of 78577139 is 93177587.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78577139 - 2⁴ = 78577123 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 78577093 and 78577102.

It is not a weakly prime, because it can be changed into another prime (78577133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39288569 + 39288570.

It is an arithmetic number, because the mean of its divisors is an integer number (39288570).

Almost surely, 2^78577139 is an apocalyptic number.

78577139 is a deficient number, since it is larger than the sum of its proper divisors (1).

78577139 is an equidigital number, since it uses as much as digits as its factorization.

78577139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 370440, while the sum is 47.

The square root of 78577139 is about 8864.3747100402. The cubic root of 78577139 is about 428.3170907691.

The spelling of 78577139 in words is "seventy-eight million, five hundred seventy-seven thousand, one hundred thirty-nine".