2145664 has 16 divisors (see below), whose sum is σ = 4274820. Its totient is φ = 1072768.

The previous prime is 2145643. The next prime is 2145677. The reversal of 2145664 is 4665412.

It is a tau number, because it is divible by the number of its divisors (16).

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8254 + ... + 8509.

2^2145664 is an apocalyptic number.

It is an amenable number.

2145664 is a deficient number, since it is larger than the sum of its proper divisors (2129156).

2145664 is an equidigital number, since it uses as much as digits as its factorization.

2145664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16777 (or 16765 counting only the distinct ones).

The product of its digits is 5760, while the sum is 28.

The square root of 2145664 is about 1464.8085199097. The cubic root of 2145664 is about 128.9794651126.

It can be divided in two parts, 2145 and 664, that added together give a square (2809 = 53²).

The spelling of 2145664 in words is "two million, one hundred forty-five thousand, six hundred sixty-four".