76787749 has 2 divisors, whose sum is σ = 76787750. Its totient is φ = 76787748.

The previous prime is 76787741. The next prime is 76787773. The reversal of 76787749 is 94778767.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62964225 + 13823524 = 7935^2 + 3718^2 .

It is an emirp because it is prime and its reverse (94778767) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 76787749 - 2³ = 76787741 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 76787749.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (76787741) 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, 38393874 + 38393875.

It is an arithmetic number, because the mean of its divisors is an integer number (38393875).

Almost surely, 2^76787749 is an apocalyptic number.

It is an amenable number.

76787749 is a deficient number, since it is larger than the sum of its proper divisors (1).

76787749 is an equidigital number, since it uses as much as digits as its factorization.

76787749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4148928, while the sum is 55.

The square root of 76787749 is about 8762.8619183461. The cubic root of 76787749 is about 425.0408246827.

The spelling of 76787749 in words is "seventy-six million, seven hundred eighty-seven thousand, seven hundred forty-nine".