74727749 has 2 divisors, whose sum is σ = 74727750. Its totient is φ = 74727748.

The previous prime is 74727727. The next prime is 74727781. The reversal of 74727749 is 94772747.

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., 48205249 + 26522500 = 6943^2 + 5150^2 .

It is an emirp because it is prime and its reverse (94772747) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 74727749 - 2⁸ = 74727493 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74727049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37363874 + 37363875.

It is an arithmetic number, because the mean of its divisors is an integer number (37363875).

Almost surely, 2^74727749 is an apocalyptic number.

It is an amenable number.

74727749 is a deficient number, since it is larger than the sum of its proper divisors (1).

74727749 is an equidigital number, since it uses as much as digits as its factorization.

74727749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 691488, while the sum is 47.

The square root of 74727749 is about 8644.5213285641. The cubic root of 74727749 is about 421.2054353265.

The spelling of 74727749 in words is "seventy-four million, seven hundred twenty-seven thousand, seven hundred forty-nine".