1645764 has 12 divisors (see below), whose sum is σ = 3840144. Its totient is φ = 548584.

The previous prime is 1645757. The next prime is 1645769. The reversal of 1645764 is 4675461.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (1645769) 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, 68562 + ... + 68585.

It is an arithmetic number, because the mean of its divisors is an integer number (320012).

2^1645764 is an apocalyptic number.

It is an amenable number.

1645764 is an abundant number, since it is smaller than the sum of its proper divisors (2194380).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1645764 is a wasteful number, since it uses less digits than its factorization.

1645764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137154 (or 137152 counting only the distinct ones).

The product of its digits is 20160, while the sum is 33.

The square root of 1645764 is about 1282.8733374733. The cubic root of 1645764 is about 118.0653664455.

The spelling of 1645764 in words is "one million, six hundred forty-five thousand, seven hundred sixty-four".