12491783928 has 128 divisors (see below), whose sum is σ = 39335520000. Its totient is φ = 3641314176.

The previous prime is 12491783879. The next prime is 12491783977. The reversal of 12491783928 is 82938719421.

12491783928 is a `hidden beast` number, since 1 + 249 + 1 + 7 + 8 + 392 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (12491783879) and next prime (12491783977).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 63718 + ... + 170421.

It is an arithmetic number, because the mean of its divisors is an integer number (307308750).

Almost surely, 2^12491783928 is an apocalyptic number.

12491783928 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

12491783928 is an abundant number, since it is smaller than the sum of its proper divisors (26843736072).

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

12491783928 is a wasteful number, since it uses less digits than its factorization.

12491783928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234186 (or 234176 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 54.

The spelling of 12491783928 in words is "twelve billion, four hundred ninety-one million, seven hundred eighty-three thousand, nine hundred twenty-eight".