12644505 has 28 divisors (see below), whose sum is σ = 22756260. Its totient is φ = 6741792.

The previous prime is 12644483. The next prime is 12644561. The reversal of 12644505 is 50544621.

12644505 is a `hidden beast` number, since 12 + 644 + 5 + 0 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1971216 + 10673289 = 1404^2 + 3267^2 .

It is not a de Polignac number, because 12644505 - 2⁵ = 12644473 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 1911 + ... + 5379.

Almost surely, 2^12644505 is an apocalyptic number.

12644505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12644505 is a deficient number, since it is larger than the sum of its proper divisors (10111755).

12644505 is an frugal number, since it uses more digits than its factorization.

12644505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3492 (or 3477 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 12644505 is about 3555.9112756085. The cubic root of 12644505 is about 232.9703278417.

The spelling of 12644505 in words is "twelve million, six hundred forty-four thousand, five hundred five".