74473657 has 2 divisors, whose sum is σ = 74473658. Its totient is φ = 74473656.

The previous prime is 74473643. The next prime is 74473669. The reversal of 74473657 is 75637447.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72863296 + 1610361 = 8536^2 + 1269^2 .

It is an emirp because it is prime and its reverse (75637447) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 74473657 - 2¹¹ = 74471609 is a prime.

It is not a weakly prime, because it can be changed into another prime (74473757) 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, 37236828 + 37236829.

It is an arithmetic number, because the mean of its divisors is an integer number (37236829).

Almost surely, 2^74473657 is an apocalyptic number.

It is an amenable number.

74473657 is a deficient number, since it is larger than the sum of its proper divisors (1).

74473657 is an equidigital number, since it uses as much as digits as its factorization.

74473657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 493920, while the sum is 43.

The square root of 74473657 is about 8629.8121068770. The cubic root of 74473657 is about 420.7274938838.

The spelling of 74473657 in words is "seventy-four million, four hundred seventy-three thousand, six hundred fifty-seven".