12644420 has 12 divisors (see below), whose sum is σ = 26553324. Its totient is φ = 5057760.

The previous prime is 12644393. The next prime is 12644459. The reversal of 12644420 is 2444621.

It can be written as a sum of positive squares in 2 ways, for example, as 9935104 + 2709316 = 3152^2 + 1646^2 .

It is a hoax number, since the sum of its digits (23) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 316091 + ... + 316130.

It is an arithmetic number, because the mean of its divisors is an integer number (2212777).

Almost surely, 2^12644420 is an apocalyptic number.

12644420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12644420 is an abundant number, since it is smaller than the sum of its proper divisors (13908904).

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

12644420 is a wasteful number, since it uses less digits than its factorization.

12644420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 632230 (or 632228 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 12644420 is about 3555.8993236592. The cubic root of 12644420 is about 232.9698058094.

The spelling of 12644420 in words is "twelve million, six hundred forty-four thousand, four hundred twenty".