74557709 has 2 divisors, whose sum is σ = 74557710. Its totient is φ = 74557708.

The previous prime is 74557673. The next prime is 74557771. The reversal of 74557709 is 90775547.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61669609 + 12888100 = 7853^2 + 3590^2 .

It is a cyclic number.

It is not a de Polignac number, because 74557709 - 2²⁰ = 73509133 is a prime.

It is a Chen prime.

It is equal to p_4369895 and since 74557709 and 4369895 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 74557709.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74557009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37278854 + 37278855.

It is an arithmetic number, because the mean of its divisors is an integer number (37278855).

Almost surely, 2^74557709 is an apocalyptic number.

It is an amenable number.

74557709 is a deficient number, since it is larger than the sum of its proper divisors (1).

74557709 is an equidigital number, since it uses as much as digits as its factorization.

74557709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 308700, while the sum is 44.

The square root of 74557709 is about 8634.6805962931. The cubic root of 74557709 is about 420.8857139997.

The spelling of 74557709 in words is "seventy-four million, five hundred fifty-seven thousand, seven hundred nine".