12640472 has 32 divisors (see below), whose sum is σ = 26871600. Its totient is φ = 5526144.

The previous prime is 12640451. The next prime is 12640477. The reversal of 12640472 is 27404621.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12640477) 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, 1223 + ... + 5174.

Almost surely, 2^12640472 is an apocalyptic number.

It is an amenable number.

12640472 is an abundant number, since it is smaller than the sum of its proper divisors (14231128).

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

12640472 is a wasteful number, since it uses less digits than its factorization.

12640472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6435 (or 6431 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 26.

The square root of 12640472 is about 3555.3441464927. The cubic root of 12640472 is about 232.9455563635.

The spelling of 12640472 in words is "twelve million, six hundred forty thousand, four hundred seventy-two".