745028257 has 2 divisors, whose sum is σ = 745028258. Its totient is φ = 745028256.

The previous prime is 745028243. The next prime is 745028287. The reversal of 745028257 is 752820547.

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., 635846656 + 109181601 = 25216^2 + 10449^2 .

It is a cyclic number.

It is not a de Polignac number, because 745028257 - 2²³ = 736639649 is a prime.

It is not a weakly prime, because it can be changed into another prime (745028227) 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, 372514128 + 372514129.

It is an arithmetic number, because the mean of its divisors is an integer number (372514129).

Almost surely, 2^745028257 is an apocalyptic number.

It is an amenable number.

745028257 is a deficient number, since it is larger than the sum of its proper divisors (1).

745028257 is an equidigital number, since it uses as much as digits as its factorization.

745028257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 156800, while the sum is 40.

The square root of 745028257 is about 27295.2057511937. The cubic root of 745028257 is about 906.5482312828.

The spelling of 745028257 in words is "seven hundred forty-five million, twenty-eight thousand, two hundred fifty-seven".