1681288 has 24 divisors (see below), whose sum is σ = 3667950. Its totient is φ = 720384.

The previous prime is 1681279. The next prime is 1681289. The reversal of 1681288 is 8821861.

It can be written as a sum of positive squares in only one way, i.e., 1044484 + 636804 = 1022^2 + 798^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1681289) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1753 + ... + 2536.

2^1681288 is an apocalyptic number.

It is an amenable number.

1681288 is an abundant number, since it is smaller than the sum of its proper divisors (1986662).

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

1681288 is a wasteful number, since it uses less digits than its factorization.

1681288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4309 (or 4298 counting only the distinct ones).

The product of its digits is 6144, while the sum is 34.

The square root of 1681288 is about 1296.6449012741. The cubic root of 1681288 is about 118.9088113403.

It can be divided in two parts, 16812 and 88, that added together give a square (16900 = 130²).

The spelling of 1681288 in words is "one million, six hundred eighty-one thousand, two hundred eighty-eight".