74564993 has 2 divisors, whose sum is σ = 74564994. Its totient is φ = 74564992.

The previous prime is 74564989. The next prime is 74565041. The reversal of 74564993 is 39946547.

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., 43784689 + 30780304 = 6617^2 + 5548^2 .

It is an emirp because it is prime and its reverse (39946547) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 74564993 - 2² = 74564989 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 (74564923) 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, 37282496 + 37282497.

It is an arithmetic number, because the mean of its divisors is an integer number (37282497).

Almost surely, 2^74564993 is an apocalyptic number.

It is an amenable number.

74564993 is a deficient number, since it is larger than the sum of its proper divisors (1).

74564993 is an equidigital number, since it uses as much as digits as its factorization.

74564993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 816480, while the sum is 47.

The square root of 74564993 is about 8635.1023734522. The cubic root of 74564993 is about 420.8994198559.

It can be divided in two parts, 74564 and 993, that added together give a palindrome (75557).

The spelling of 74564993 in words is "seventy-four million, five hundred sixty-four thousand, nine hundred ninety-three".