1688941056 has 80 divisors (see below), whose sum is σ = 4908534048. Its totient is φ = 511795200.

The previous prime is 1688941043. The next prime is 1688941073. The reversal of 1688941056 is 6501498861.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a junction number, because it is equal to n+sod(n) for n = 1688940996 and 1688941014.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33085 + ... + 66876.

Almost surely, 2^1688941056 is an apocalyptic number.

1688941056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1688941056 is an abundant number, since it is smaller than the sum of its proper divisors (3219592992).

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

1688941056 is an equidigital number, since it uses as much as digits as its factorization.

1688941056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99993 (or 99977 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 48.

The square root of 1688941056 is about 41096.7280449429. The cubic root of 1688941056 is about 1190.8895864525.

The spelling of 1688941056 in words is "one billion, six hundred eighty-eight million, nine hundred forty-one thousand, fifty-six".