77000639 has 2 divisors, whose sum is σ = 77000640. Its totient is φ = 77000638.

The previous prime is 77000629. The next prime is 77000641. The reversal of 77000639 is 93600077.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 77000639 - 2⁸ = 77000383 is a prime.

It is a Sophie Germain prime.

Together with 77000641, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77000629) 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, 38500319 + 38500320.

It is an arithmetic number, because the mean of its divisors is an integer number (38500320).

Almost surely, 2^77000639 is an apocalyptic number.

77000639 is a deficient number, since it is larger than the sum of its proper divisors (1).

77000639 is an equidigital number, since it uses as much as digits as its factorization.

77000639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7938, while the sum is 32.

The square root of 77000639 is about 8775.0007977208. Note that the first 3 decimals coincide. The cubic root of 77000639 is about 425.4332633528.

The spelling of 77000639 in words is "seventy-seven million, six hundred thirty-nine", and thus it is an aban number.