1688705352 has 48 divisors (see below), whose sum is σ = 4577917500. Its totient is φ = 562367616.

The previous prime is 1688705341. The next prime is 1688705363. The reversal of 1688705352 is 2535078861.

It is an interprime number because it is at equal distance from previous prime (1688705341) and next prime (1688705363).

It can be written as a sum of positive squares in 2 ways, for example, as 1211457636 + 477247716 = 34806^2 + 21846^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1688705298 and 1688705307.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 69274 + ... + 90422.

Almost surely, 2^1688705352 is an apocalyptic number.

1688705352 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1688705352 is an abundant number, since it is smaller than the sum of its proper divisors (2889212148).

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

1688705352 is a wasteful number, since it uses less digits than its factorization.

1688705352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22270 (or 22263 counting only the distinct ones).

The product of its (nonzero) digits is 403200, while the sum is 45.

The square root of 1688705352 is about 41093.8602713349. The cubic root of 1688705352 is about 1190.8341847761.

The spelling of 1688705352 in words is "one billion, six hundred eighty-eight million, seven hundred five thousand, three hundred fifty-two".