74889257 has 2 divisors, whose sum is σ = 74889258. Its totient is φ = 74889256.

The previous prime is 74889251. The next prime is 74889259. The reversal of 74889257 is 75298847.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58736896 + 16152361 = 7664^2 + 4019^2 .

It is a cyclic number.

It is not a de Polignac number, because 74889257 - 2²⁰ = 73840681 is a prime.

Together with 74889259, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (74889251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37444628 + 37444629.

It is an arithmetic number, because the mean of its divisors is an integer number (37444629).

Almost surely, 2^74889257 is an apocalyptic number.

It is an amenable number.

74889257 is a deficient number, since it is larger than the sum of its proper divisors (1).

74889257 is an equidigital number, since it uses as much as digits as its factorization.

74889257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1128960, while the sum is 50.

The square root of 74889257 is about 8653.8579258040. The cubic root of 74889257 is about 421.5086653750.

The spelling of 74889257 in words is "seventy-four million, eight hundred eighty-nine thousand, two hundred fifty-seven".