19764278730 has 48 divisors (see below), whose sum is σ = 58728144384. Its totient is φ = 4517549280.

The previous prime is 19764278719. The next prime is 19764278773. The reversal of 19764278730 is 3787246791.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15685306 + ... + 15686565.

It is an arithmetic number, because the mean of its divisors is an integer number (1223503008).

Almost surely, 2^19764278730 is an apocalyptic number.

19764278730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19764278730 is an abundant number, since it is smaller than the sum of its proper divisors (38963865654).

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

19764278730 is a wasteful number, since it uses less digits than its factorization.

19764278730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31371891 (or 31371888 counting only the distinct ones).

The product of its (nonzero) digits is 3556224, while the sum is 54.

The spelling of 19764278730 in words is "nineteen billion, seven hundred sixty-four million, two hundred seventy-eight thousand, seven hundred thirty".