1664604 has 24 divisors (see below), whose sum is σ = 4315920. Its totient is φ = 554832.

The previous prime is 1664569. The next prime is 1664627. The reversal of 1664604 is 4064661.

1664604 is a `hidden beast` number, since 16 + 646 + 0 + 4 = 666.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7599 + ... + 7814.

It is an arithmetic number, because the mean of its divisors is an integer number (179830).

2^1664604 is an apocalyptic number.

It is an amenable number.

1664604 is an abundant number, since it is smaller than the sum of its proper divisors (2651316).

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

1664604 is a wasteful number, since it uses less digits than its factorization.

1664604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15426 (or 15418 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 1664604 is about 1290.1953340483. The cubic root of 1664604 is about 118.5141787232.

It can be divided in two parts, 166460 and 4, that added together give a square (166464 = 408²).

The spelling of 1664604 in words is "one million, six hundred sixty-four thousand, six hundred four".