12688650 has 120 divisors (see below), whose sum is σ = 38125164. Its totient is φ = 3110400.

The previous prime is 12688649. The next prime is 12688679. The reversal of 12688650 is 5688621.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 3814209 + 8874441 = 1953^2 + 2979^2 .

It is a super-2 number, since 2×12688650² = 322003677645000, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 52530 + ... + 52770.

Almost surely, 2^12688650 is an apocalyptic number.

12688650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 12688650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19062582).

12688650 is an abundant number, since it is smaller than the sum of its proper divisors (25436514).

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

12688650 is a wasteful number, since it uses less digits than its factorization.

12688650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278 (or 264 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 12688650 is about 3562.1131368894. The cubic root of 12688650 is about 233.2411313715.

The spelling of 12688650 in words is "twelve million, six hundred eighty-eight thousand, six hundred fifty".