64407217 has 6 divisors (see below), whose sum is σ = 74922738. Its totient is φ = 55206144.

The previous prime is 64407191. The next prime is 64407227. The reversal of 64407217 is 71270446.

It can be written as a sum of positive squares in only one way, i.e., 33593616 + 30813601 = 5796^2 + 5551^2 .

It is a de Polignac number, because none of the positive numbers 2^k-64407217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64407227) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 657168 + ... + 657265.

It is an arithmetic number, because the mean of its divisors is an integer number (12487123).

Almost surely, 2^64407217 is an apocalyptic number.

It is an amenable number.

64407217 is a deficient number, since it is larger than the sum of its proper divisors (10515521).

64407217 is a wasteful number, since it uses less digits than its factorization.

64407217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1314447 (or 1314440 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 31.

The square root of 64407217 is about 8025.4107060013. The cubic root of 64407217 is about 400.8465757597.

The spelling of 64407217 in words is "sixty-four million, four hundred seven thousand, two hundred seventeen".