1664676 has 36 divisors (see below), whose sum is σ = 4532892. Its totient is φ = 512064.

The previous prime is 1664653. The next prime is 1664681. The reversal of 1664676 is 6764661.

1664676 is a `hidden beast` number, since 1 + 6 + 646 + 7 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 224676 + 1440000 = 474^2 + 1200^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×1664676² = 5542292369952, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 1664676.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1311 + ... + 2246.

2^1664676 is an apocalyptic number.

It is an amenable number.

1664676 is an abundant number, since it is smaller than the sum of its proper divisors (2868216).

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

1664676 is a wasteful number, since it uses less digits than its factorization.

1664676 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3580 (or 3575 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 1664676 is about 1290.2232364982. The cubic root of 1664676 is about 118.5158874175.

It can be divided in two parts, 1664 and 676, that multiplied together give a cube (1124864 = 104³).

The spelling of 1664676 in words is "one million, six hundred sixty-four thousand, six hundred seventy-six".