1778923454920 has 64 divisors (see below), whose sum is σ = 4182495264000. Its totient is φ = 679671345408.

The previous prime is 1778923454911. The next prime is 1778923454939. The reversal of 1778923454920 is 294543298771.

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 15 ways as a sum of consecutive naturals, for example, 711340 + ... + 2015899.

It is an arithmetic number, because the mean of its divisors is an integer number (65351488500).

Almost surely, 2^{1778923454920} is an apocalyptic number.

1778923454920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1778923454920 is an abundant number, since it is smaller than the sum of its proper divisors (2403571809080).

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

1778923454920 is a wasteful number, since it uses less digits than its factorization.

1778923454920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2727982 (or 2727978 counting only the distinct ones).

The product of its (nonzero) digits is 30481920, while the sum is 61.

The spelling of 1778923454920 in words is "one trillion, seven hundred seventy-eight billion, nine hundred twenty-three million, four hundred fifty-four thousand, nine hundred twenty".