64000257 has 8 divisors (see below), whose sum is σ = 90353376. Its totient is φ = 40156992.

The previous prime is 64000249. The next prime is 64000273. The reversal of 64000257 is 75200046.

It is a happy number.

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

It is not a de Polignac number, because 64000257 - 2³ = 64000249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64000217) 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, 627403 + ... + 627504.

It is an arithmetic number, because the mean of its divisors is an integer number (11294172).

Almost surely, 2^64000257 is an apocalyptic number.

It is an amenable number.

64000257 is a deficient number, since it is larger than the sum of its proper divisors (26353119).

64000257 is a wasteful number, since it uses less digits than its factorization.

64000257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1254927.

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 64000257 is about 8000.0160624839. The cubic root of 64000257 is about 400.0005354159. Note that the first 3 decimals are identical.

The spelling of 64000257 in words is "sixty-four million, two hundred fifty-seven", and thus it is an aban number.