12782783920 has 20 divisors (see below), whose sum is σ = 29719972800. Its totient is φ = 5113113536.

The previous prime is 12782783887. The next prime is 12782783927. The reversal of 12782783920 is 2938728721.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (12782783927) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79892320 + ... + 79892479.

It is an arithmetic number, because the mean of its divisors is an integer number (1485998640).

Almost surely, 2^12782783920 is an apocalyptic number.

12782783920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12782783920 is an abundant number, since it is smaller than the sum of its proper divisors (16937188880).

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

12782783920 is a wasteful number, since it uses less digits than its factorization.

12782783920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159784812 (or 159784806 counting only the distinct ones).

The product of its (nonzero) digits is 677376, while the sum is 49.

The spelling of 12782783920 in words is "twelve billion, seven hundred eighty-two million, seven hundred eighty-three thousand, nine hundred twenty".