10688661 has 6 divisors (see below), whose sum is σ = 15439190. Its totient is φ = 7125768.

The previous prime is 10688651. The next prime is 10688677. The reversal of 10688661 is 16688601.

It can be written as a sum of positive squares in only one way, i.e., 10595025 + 93636 = 3255^2 + 306^2 .

It is a de Polignac number, because none of the positive numbers 2^k-10688661 is a prime.

It is a super-2 number, since 2×10688661² = 228494947945842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10688611) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 593806 + ... + 593823.

Almost surely, 2^10688661 is an apocalyptic number.

It is an amenable number.

10688661 is a deficient number, since it is larger than the sum of its proper divisors (4750529).

10688661 is a wasteful number, since it uses less digits than its factorization.

10688661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1187635 (or 1187632 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 10688661 is about 3269.3517706114. The cubic root of 10688661 is about 220.2796787382.

The spelling of 10688661 in words is "ten million, six hundred eighty-eight thousand, six hundred sixty-one".