76749749 has 2 divisors, whose sum is σ = 76749750. Its totient is φ = 76749748.

The previous prime is 76749733. The next prime is 76749763. The reversal of 76749749 is 94794767.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63840100 + 12909649 = 7990^2 + 3593^2 .

It is an emirp because it is prime and its reverse (94794767) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 76749749 - 2⁴ = 76749733 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 76749749.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (76749779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38374874 + 38374875.

It is an arithmetic number, because the mean of its divisors is an integer number (38374875).

Almost surely, 2^76749749 is an apocalyptic number.

It is an amenable number.

76749749 is a deficient number, since it is larger than the sum of its proper divisors (1).

76749749 is an equidigital number, since it uses as much as digits as its factorization.

76749749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2667168, while the sum is 53.

The square root of 76749749 is about 8760.6934086293. The cubic root of 76749749 is about 424.9706997101.

The spelling of 76749749 in words is "seventy-six million, seven hundred forty-nine thousand, seven hundred forty-nine".