75777749 has 2 divisors, whose sum is σ = 75777750. Its totient is φ = 75777748.

The previous prime is 75777743. The next prime is 75777761. The reversal of 75777749 is 94777757.

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., 75603025 + 174724 = 8695^2 + 418^2 .

It is a cyclic number.

It is not a de Polignac number, because 75777749 - 2¹⁶ = 75712213 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 75777749.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75777743) 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, 37888874 + 37888875.

It is an arithmetic number, because the mean of its divisors is an integer number (37888875).

Almost surely, 2^75777749 is an apocalyptic number.

It is an amenable number.

75777749 is a deficient number, since it is larger than the sum of its proper divisors (1).

75777749 is an equidigital number, since it uses as much as digits as its factorization.

75777749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3025260, while the sum is 53.

The square root of 75777749 is about 8705.0415851965. The cubic root of 75777749 is about 423.1690535134.

The spelling of 75777749 in words is "seventy-five million, seven hundred seventy-seven thousand, seven hundred forty-nine".