1688280772 has 6 divisors (see below), whose sum is σ = 2954491358. Its totient is φ = 844140384.

The previous prime is 1688280767. The next prime is 1688280773. The reversal of 1688280772 is 2770828861.

It can be written as a sum of positive squares in only one way, i.e., 1369444036 + 318836736 = 37006^2 + 17856^2 .

It is not an unprimeable number, because it can be changed into a prime (1688280773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211035093 + ... + 211035100.

Almost surely, 2^1688280772 is an apocalyptic number.

It is an amenable number.

1688280772 is a deficient number, since it is larger than the sum of its proper divisors (1266210586).

1688280772 is a wasteful number, since it uses less digits than its factorization.

1688280772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 422070197 (or 422070195 counting only the distinct ones).

The product of its (nonzero) digits is 602112, while the sum is 49.

The square root of 1688280772 is about 41088.6939680492. The cubic root of 1688280772 is about 1190.7343752273.

The spelling of 1688280772 in words is "one billion, six hundred eighty-eight million, two hundred eighty thousand, seven hundred seventy-two".