645417 has 6 divisors (see below), whose sum is σ = 932282. Its totient is φ = 430272.

The previous prime is 645409. The next prime is 645419. The reversal of 645417 is 714546.

645417 is a `hidden beast` number, since 645 + 4 + 17 = 666.

645417 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 488601 + 156816 = 699^2 + 396^2 .

It is not a de Polignac number, because 645417 - 2³ = 645409 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 645417.

It is not an unprimeable number, because it can be changed into a prime (645419) 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, 35848 + ... + 35865.

2⁶⁴⁵⁴¹⁷ is an apocalyptic number.

It is an amenable number.

645417 is a deficient number, since it is larger than the sum of its proper divisors (286865).

645417 is a wasteful number, since it uses less digits than its factorization.

645417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71719 (or 71716 counting only the distinct ones).

The product of its digits is 3360, while the sum is 27.

The square root of 645417 is about 803.3784911236. The cubic root of 645417 is about 86.4198417650.

The spelling of 645417 in words is "six hundred forty-five thousand, four hundred seventeen".