64505687 has 4 divisors (see below), whose sum is σ = 65230560. Its totient is φ = 63780816.

The previous prime is 64505671. The next prime is 64505723. The reversal of 64505687 is 78650546.

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 64505687 - 2⁴ = 64505671 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64501687) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 362303 + ... + 362480.

It is an arithmetic number, because the mean of its divisors is an integer number (16307640).

Almost surely, 2^64505687 is an apocalyptic number.

64505687 is a deficient number, since it is larger than the sum of its proper divisors (724873).

64505687 is an equidigital number, since it uses as much as digits as its factorization.

64505687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 724872.

The product of its (nonzero) digits is 201600, while the sum is 41.

The square root of 64505687 is about 8031.5432514555. The cubic root of 64505687 is about 401.0507519672.

The spelling of 64505687 in words is "sixty-four million, five hundred five thousand, six hundred eighty-seven".