12638660 has 24 divisors (see below), whose sum is σ = 27190296. Its totient is φ = 4931840.

The previous prime is 12638621. The next prime is 12638663. The reversal of 12638660 is 6683621.

It can be written as a sum of positive squares in 4 ways, for example, as 749956 + 11888704 = 866^2 + 3448^2 .

It is not an unprimeable number, because it can be changed into a prime (12638663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6887 + ... + 8526.

It is an arithmetic number, because the mean of its divisors is an integer number (1132929).

Almost surely, 2^12638660 is an apocalyptic number.

12638660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12638660 is an abundant number, since it is smaller than the sum of its proper divisors (14551636).

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

12638660 is a wasteful number, since it uses less digits than its factorization.

12638660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15463 (or 15461 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 12638660 is about 3555.0893097080. The cubic root of 12638660 is about 232.9344249880.

The spelling of 12638660 in words is "twelve million, six hundred thirty-eight thousand, six hundred sixty".