12637640 has 32 divisors (see below), whose sum is σ = 28599480. Its totient is φ = 5025792.

The previous prime is 12637637. The next prime is 12637673. The reversal of 12637640 is 4673621.

It can be written as a sum of positive squares in 4 ways, for example, as 4831204 + 7806436 = 2198^2 + 2794^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6902 + ... + 8538.

Almost surely, 2^12637640 is an apocalyptic number.

12637640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12637640 is an abundant number, since it is smaller than the sum of its proper divisors (15961840).

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

12637640 is a wasteful number, since it uses less digits than its factorization.

12637640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1841 (or 1837 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 12637640 is about 3554.9458505018. The cubic root of 12637640 is about 232.9281585140.

The spelling of 12637640 in words is "twelve million, six hundred thirty-seven thousand, six hundred forty".