12781720990 has 8 divisors (see below), whose sum is σ = 23007097800. Its totient is φ = 5112688392.

The previous prime is 12781720979. The next prime is 12781720999. The reversal of 12781720990 is 9902718721.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 12781720990.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12781720999) 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, 639086040 + ... + 639086059.

It is an arithmetic number, because the mean of its divisors is an integer number (2875887225).

Almost surely, 2^12781720990 is an apocalyptic number.

12781720990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12781720990 is a deficient number, since it is larger than the sum of its proper divisors (10225376810).

12781720990 is a wasteful number, since it uses less digits than its factorization.

12781720990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1278172106.

The product of its (nonzero) digits is 127008, while the sum is 46.

The spelling of 12781720990 in words is "twelve billion, seven hundred eighty-one million, seven hundred twenty thousand, nine hundred ninety".