12640432 has 60 divisors (see below), whose sum is σ = 29770416. Its totient is φ = 5174400.

The previous prime is 12640429. The next prime is 12640451. The reversal of 12640432 is 23404621.

It is a happy number.

It is a super-2 number, since 2×12640432² = 319561042293248, which contains 22 as substring.

It is a hoax number, since the sum of its digits (22) 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 11 ways as a sum of consecutive naturals, for example, 17682 + ... + 18382.

Almost surely, 2^12640432 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12640432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14885208).

12640432 is an abundant number, since it is smaller than the sum of its proper divisors (17129984).

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

12640432 is a wasteful number, since it uses less digits than its factorization.

12640432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 746 (or 733 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 12640432 is about 3555.3385211538. The cubic root of 12640432 is about 232.9453106492.

The spelling of 12640432 in words is "twelve million, six hundred forty thousand, four hundred thirty-two".