405243787728 has 40 divisors (see below), whose sum is σ = 1127409000928. Its totient is φ = 124690396032.

The previous prime is 405243787723. The next prime is 405243787747. The reversal of 405243787728 is 827787342504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405243787723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 324713950 + ... + 324715197.

Almost surely, 2^405243787728 is an apocalyptic number.

405243787728 is a gapful number since it is divisible by the number (48) formed by its first and last digit.

It is an amenable number.

405243787728 is an abundant number, since it is smaller than the sum of its proper divisors (722165213200).

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

405243787728 is a wasteful number, since it uses less digits than its factorization.

405243787728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 649429171 (or 649429165 counting only the distinct ones).

The product of its (nonzero) digits is 21073920, while the sum is 57.

The spelling of 405243787728 in words is "four hundred five billion, two hundred forty-three million, seven hundred eighty-seven thousand, seven hundred twenty-eight".