1645064 has 8 divisors (see below), whose sum is σ = 3084510. Its totient is φ = 822528.

The previous prime is 1645019. The next prime is 1645087. The reversal of 1645064 is 4605461.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1582564 + 62500 = 1258^2 + 250^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102809 + ... + 102824.

2^1645064 is an apocalyptic number.

It is an amenable number.

1645064 is a deficient number, since it is larger than the sum of its proper divisors (1439446).

1645064 is a wasteful number, since it uses less digits than its factorization.

1645064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205639 (or 205635 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 1645064 is about 1282.6004833930. The cubic root of 1645064 is about 118.0486249854.

The spelling of 1645064 in words is "one million, six hundred forty-five thousand, sixty-four".