64670217 has 4 divisors (see below), whose sum is σ = 86226960. Its totient is φ = 43113476.

The previous prime is 64670153. The next prime is 64670233. The reversal of 64670217 is 71207646.

64670217 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 64670217 - 2⁶ = 64670153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64670267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10778367 + ... + 10778372.

It is an arithmetic number, because the mean of its divisors is an integer number (21556740).

Almost surely, 2^64670217 is an apocalyptic number.

It is an amenable number.

64670217 is a deficient number, since it is larger than the sum of its proper divisors (21556743).

64670217 is a wasteful number, since it uses less digits than its factorization.

64670217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21556742.

The product of its (nonzero) digits is 14112, while the sum is 33.

The square root of 64670217 is about 8041.7794672572. The cubic root of 64670217 is about 401.3914395442.

The spelling of 64670217 in words is "sixty-four million, six hundred seventy thousand, two hundred seventeen".