64707257 has 8 divisors (see below), whose sum is σ = 67623360. Its totient is φ = 61799760.

The previous prime is 64707239. The next prime is 64707259. The reversal of 64707257 is 75270746.

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 64707257 - 2⁸ = 64707001 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64707257.

It is not an unprimeable number, because it can be changed into a prime (64707259) 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 in 7 ways as a sum of consecutive naturals, for example, 16919 + ... + 20387.

It is an arithmetic number, because the mean of its divisors is an integer number (8452920).

Almost surely, 2^64707257 is an apocalyptic number.

It is an amenable number.

64707257 is a deficient number, since it is larger than the sum of its proper divisors (2916103).

64707257 is a wasteful number, since it uses less digits than its factorization.

64707257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4303.

The product of its (nonzero) digits is 82320, while the sum is 38.

The square root of 64707257 is about 8044.0821104710. The cubic root of 64707257 is about 401.4680575096.

The spelling of 64707257 in words is "sixty-four million, seven hundred seven thousand, two hundred fifty-seven".