1664500 has 24 divisors (see below), whose sum is σ = 3636360. Its totient is φ = 665600.

The previous prime is 1664461. The next prime is 1664501. The reversal of 1664500 is 54661.

It can be written as a sum of positive squares in 4 ways, for example, as 116964 + 1547536 = 342^2 + 1244^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1165 + ... + 2164.

It is an arithmetic number, because the mean of its divisors is an integer number (151515).

2^1664500 is an apocalyptic number.

1664500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1664500 is an abundant number, since it is smaller than the sum of its proper divisors (1971860).

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

1664500 is a wasteful number, since it uses less digits than its factorization.

1664500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3348 (or 3336 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 1664500 is about 1290.1550294441. The cubic root of 1664500 is about 118.5117105223.

It can be divided in two parts, 16 and 64500, that added together give a square (64516 = 254²).

The spelling of 1664500 in words is "one million, six hundred sixty-four thousand, five hundred".