1688442656 has 12 divisors (see below), whose sum is σ = 3324121542. Its totient is φ = 844221312.

The previous prime is 1688442653. The next prime is 1688442661. The reversal of 1688442656 is 6562448861.

It can be written as a sum of positive squares in only one way, i.e., 1687895056 + 547600 = 41084^2 + 740^2 .

It is not an unprimeable number, because it can be changed into a prime (1688442653) 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, 26381885 + ... + 26381948.

Almost surely, 2^1688442656 is an apocalyptic number.

1688442656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1688442656 is a deficient number, since it is larger than the sum of its proper divisors (1635678886).

1688442656 is an equidigital number, since it uses as much as digits as its factorization.

1688442656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52763843 (or 52763835 counting only the distinct ones).

The product of its digits is 2211840, while the sum is 50.

The square root of 1688442656 is about 41090.6638544573. The cubic root of 1688442656 is about 1190.7724326180.

The spelling of 1688442656 in words is "one billion, six hundred eighty-eight million, four hundred forty-two thousand, six hundred fifty-six".