74644721 has 2 divisors, whose sum is σ = 74644722. Its totient is φ = 74644720.

The previous prime is 74644699. The next prime is 74644727. The reversal of 74644721 is 12744647.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57214096 + 17430625 = 7564^2 + 4175^2 .

It is an emirp because it is prime and its reverse (12744647) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 74644721 - 2⁶ = 74644657 is a prime.

It is not a weakly prime, because it can be changed into another prime (74644727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37322360 + 37322361.

It is an arithmetic number, because the mean of its divisors is an integer number (37322361).

Almost surely, 2^74644721 is an apocalyptic number.

It is an amenable number.

74644721 is a deficient number, since it is larger than the sum of its proper divisors (1).

74644721 is an equidigital number, since it uses as much as digits as its factorization.

74644721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 37632, while the sum is 35.

The square root of 74644721 is about 8639.7176458493. The cubic root of 74644721 is about 421.0493808244.

The spelling of 74644721 in words is "seventy-four million, six hundred forty-four thousand, seven hundred twenty-one".