64257707 has 4 divisors (see below), whose sum is σ = 66473520. Its totient is φ = 62041896.

The previous prime is 64257689. The next prime is 64257709. The reversal of 64257707 is 70775246.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 64257707 - 2¹⁰ = 64256683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64257709) 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 3 ways as a sum of consecutive naturals, for example, 1107863 + ... + 1107920.

It is an arithmetic number, because the mean of its divisors is an integer number (16618380).

Almost surely, 2^64257707 is an apocalyptic number.

64257707 is a deficient number, since it is larger than the sum of its proper divisors (2215813).

64257707 is a wasteful number, since it uses less digits than its factorization.

64257707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2215812.

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

The square root of 64257707 is about 8016.0905059761. The cubic root of 64257707 is about 400.5361705650.

The spelling of 64257707 in words is "sixty-four million, two hundred fifty-seven thousand, seven hundred seven".