76669639 has 2 divisors, whose sum is σ = 76669640. Its totient is φ = 76669638.

The previous prime is 76669613. The next prime is 76669667. The reversal of 76669639 is 93696667.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 76669639 - 2¹⁵ = 76636871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (76669669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38334819 + 38334820.

It is an arithmetic number, because the mean of its divisors is an integer number (38334820).

Almost surely, 2^76669639 is an apocalyptic number.

76669639 is a deficient number, since it is larger than the sum of its proper divisors (1).

76669639 is an equidigital number, since it uses as much as digits as its factorization.

76669639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2204496, while the sum is 52.

The square root of 76669639 is about 8756.1200882583. The cubic root of 76669639 is about 424.8227893259.

The spelling of 76669639 in words is "seventy-six million, six hundred sixty-nine thousand, six hundred thirty-nine".