1680256 has 16 divisors (see below), whose sum is σ = 3347640. Its totient is φ = 840064.

The previous prime is 1680253. The next prime is 1680269. The reversal of 1680256 is 6520861.

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

It is a Smith number, since the sum of its digits (28) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1680253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6436 + ... + 6691.

2^1680256 is an apocalyptic number.

1680256 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1680256 is a deficient number, since it is larger than the sum of its proper divisors (1667384).

1680256 is an equidigital number, since it uses as much as digits as its factorization.

1680256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13141 (or 13129 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 1680256 is about 1296.2468900638. The cubic root of 1680256 is about 118.8844770185.

It can be divided in two parts, 1680 and 256, that added together give a square (1936 = 44²).

The spelling of 1680256 in words is "one million, six hundred eighty thousand, two hundred fifty-six".