76436309 has 2 divisors, whose sum is σ = 76436310. Its totient is φ = 76436308.

The previous prime is 76436303. The next prime is 76436323. The reversal of 76436309 is 90363467.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65691025 + 10745284 = 8105^2 + 3278^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-76436309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (76436303) 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, 38218154 + 38218155.

It is an arithmetic number, because the mean of its divisors is an integer number (38218155).

Almost surely, 2^76436309 is an apocalyptic number.

It is an amenable number.

76436309 is a deficient number, since it is larger than the sum of its proper divisors (1).

76436309 is an equidigital number, since it uses as much as digits as its factorization.

76436309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81648, while the sum is 38.

The square root of 76436309 is about 8742.7861119897. The cubic root of 76436309 is about 424.3913946294.

It can be divided in two parts, 764 and 36309, that multiplied together give a triangular number (27740076 = T₇₄₄₈).

The spelling of 76436309 in words is "seventy-six million, four hundred thirty-six thousand, three hundred nine".