1664072 has 8 divisors (see below), whose sum is σ = 3120150. Its totient is φ = 832032.

The previous prime is 1664071. The next prime is 1664083. The reversal of 1664072 is 2704661.

It can be written as a sum of positive squares in only one way, i.e., 1552516 + 111556 = 1246^2 + 334^2 .

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

It is not an unprimeable number, because it can be changed into a prime (1664071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103997 + ... + 104012.

2^1664072 is an apocalyptic number.

It is an amenable number.

1664072 is a deficient number, since it is larger than the sum of its proper divisors (1456078).

1664072 is a wasteful number, since it uses less digits than its factorization.

1664072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208015 (or 208011 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 1664072 is about 1289.9891472412. The cubic root of 1664072 is about 118.5015518440.

The spelling of 1664072 in words is "one million, six hundred sixty-four thousand, seventy-two".