64244257 has 8 divisors (see below), whose sum is σ = 80096832. Its totient is φ = 50060400.

The previous prime is 64244249. The next prime is 64244281. The reversal of 64244257 is 75244246.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 64244257 - 2³ = 64244249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64244237) 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 in 7 ways as a sum of consecutive naturals, for example, 417094 + ... + 417247.

It is an arithmetic number, because the mean of its divisors is an integer number (10012104).

Almost surely, 2^64244257 is an apocalyptic number.

It is an amenable number.

64244257 is a deficient number, since it is larger than the sum of its proper divisors (15852575).

64244257 is a wasteful number, since it uses less digits than its factorization.

64244257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 834359.

The product of its digits is 53760, while the sum is 34.

The square root of 64244257 is about 8015.2515244376. The cubic root of 64244257 is about 400.5082227506.

The spelling of 64244257 in words is "sixty-four million, two hundred forty-four thousand, two hundred fifty-seven".