74644309 has 2 divisors, whose sum is σ = 74644310. Its totient is φ = 74644308.

The previous prime is 74644279. The next prime is 74644327. The reversal of 74644309 is 90344647.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42120100 + 32524209 = 6490^2 + 5703^2 .

It is a cyclic number.

It is not a de Polignac number, because 74644309 - 2⁵ = 74644277 is a prime.

It is equal to p_4374667 and since 74644309 and 4374667 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74644109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37322154 + 37322155.

It is an arithmetic number, because the mean of its divisors is an integer number (37322155).

Almost surely, 2^74644309 is an apocalyptic number.

It is an amenable number.

74644309 is a deficient number, since it is larger than the sum of its proper divisors (1).

74644309 is an equidigital number, since it uses as much as digits as its factorization.

74644309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 37.

The square root of 74644309 is about 8639.6938024446. The cubic root of 74644309 is about 421.0486061652.

The spelling of 74644309 in words is "seventy-four million, six hundred forty-four thousand, three hundred nine".