64446257 has 2 divisors, whose sum is σ = 64446258. Its totient is φ = 64446256.

The previous prime is 64446227. The next prime is 64446281. The reversal of 64446257 is 75264446.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36048016 + 28398241 = 6004^2 + 5329^2 .

It is a cyclic number.

It is not a de Polignac number, because 64446257 - 2⁸ = 64446001 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64446257.

It is not a weakly prime, because it can be changed into another prime (64446227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32223128 + 32223129.

It is an arithmetic number, because the mean of its divisors is an integer number (32223129).

Almost surely, 2^64446257 is an apocalyptic number.

It is an amenable number.

64446257 is a deficient number, since it is larger than the sum of its proper divisors (1).

64446257 is an equidigital number, since it uses as much as digits as its factorization.

64446257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 161280, while the sum is 38.

The square root of 64446257 is about 8027.8426118105. The cubic root of 64446257 is about 400.9275495504.

The spelling of 64446257 in words is "sixty-four million, four hundred forty-six thousand, two hundred fifty-seven".