76638739 has 2 divisors, whose sum is σ = 76638740. Its totient is φ = 76638738.

The previous prime is 76638733. The next prime is 76638763. The reversal of 76638739 is 93783667.

It is a weak prime.

It is an emirp because it is prime and its reverse (93783667) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 76638739 - 2⁵ = 76638707 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 76638692 and 76638701.

It is not a weakly prime, because it can be changed into another prime (76638733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38319369 + 38319370.

It is an arithmetic number, because the mean of its divisors is an integer number (38319370).

Almost surely, 2^76638739 is an apocalyptic number.

76638739 is a deficient number, since it is larger than the sum of its proper divisors (1).

76638739 is an equidigital number, since it uses as much as digits as its factorization.

76638739 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1143072, while the sum is 49.

The square root of 76638739 is about 8754.3554302987. The cubic root of 76638739 is about 424.7657098514.

It can be divided in two parts, 76638 and 739, that added together give a palindrome (77377).

The spelling of 76638739 in words is "seventy-six million, six hundred thirty-eight thousand, seven hundred thirty-nine".