64442257 has 8 divisors (see below), whose sum is σ = 74436192. Its totient is φ = 55137600.

The previous prime is 64442239. The next prime is 64442267. The reversal of 64442257 is 75224446.

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 64442257 - 2²³ = 56053649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64442237) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 172119 + ... + 172492.

It is an arithmetic number, because the mean of its divisors is an integer number (9304524).

Almost surely, 2^64442257 is an apocalyptic number.

It is an amenable number.

64442257 is a deficient number, since it is larger than the sum of its proper divisors (9993935).

64442257 is a wasteful number, since it uses less digits than its factorization.

64442257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344639.

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

The square root of 64442257 is about 8027.5934750086. The cubic root of 64442257 is about 400.9192545593.

The spelling of 64442257 in words is "sixty-four million, four hundred forty-two thousand, two hundred fifty-seven".