74644649 has 2 divisors, whose sum is σ = 74644650. Its totient is φ = 74644648.

The previous prime is 74644627. The next prime is 74644657. The reversal of 74644649 is 94644647.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74511424 + 133225 = 8632^2 + 365^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-74644649 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (74644699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37322324 + 37322325.

It is an arithmetic number, because the mean of its divisors is an integer number (37322325).

Almost surely, 2^74644649 is an apocalyptic number.

It is an amenable number.

74644649 is a deficient number, since it is larger than the sum of its proper divisors (1).

74644649 is an equidigital number, since it uses as much as digits as its factorization.

74644649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 580608, while the sum is 44.

The square root of 74644649 is about 8639.7134790455. The cubic root of 74644649 is about 421.0492454473.

The spelling of 74644649 in words is "seventy-four million, six hundred forty-four thousand, six hundred forty-nine".