12640435430 has 48 divisors (see below), whose sum is σ = 27182901456. Its totient is φ = 4216726080.

The previous prime is 12640435429. The next prime is 12640435439. The reversal of 12640435430 is 3453404621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12640435439) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 330476 + ... + 366735.

It is an arithmetic number, because the mean of its divisors is an integer number (566310447).

Almost surely, 2^12640435430 is an apocalyptic number.

12640435430 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12640435430 is an abundant number, since it is smaller than the sum of its proper divisors (14542466026).

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

12640435430 is a wasteful number, since it uses less digits than its factorization.

12640435430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 697269 (or 697262 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 32.

The spelling of 12640435430 in words is "twelve billion, six hundred forty million, four hundred thirty-five thousand, four hundred thirty".