1688662696 has 72 divisors (see below), whose sum is σ = 3887560170. Its totient is φ = 685564992.

The previous prime is 1688662681. The next prime is 1688662697. The reversal of 1688662696 is 6962668861.

It can be written as a sum of positive squares in only one way, i.e., 1177450596 + 511212100 = 34314^2 + 22610^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1688662696.

It is not an unprimeable number, because it can be changed into a prime (1688662697) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 135546 + ... + 147478.

Almost surely, 2^1688662696 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1688662696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1943780085).

1688662696 is an abundant number, since it is smaller than the sum of its proper divisors (2198897474).

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

1688662696 is a wasteful number, since it uses less digits than its factorization.

1688662696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11991 (or 11961 counting only the distinct ones).

The product of its digits is 8957952, while the sum is 58.

The square root of 1688662696 is about 41093.3412610851. The cubic root of 1688662696 is about 1190.8241580317.

The spelling of 1688662696 in words is "one billion, six hundred eighty-eight million, six hundred sixty-two thousand, six hundred ninety-six".