1643038818428 has 48 divisors (see below), whose sum is σ = 3312515903424. Its totient is φ = 698509094400.

The previous prime is 1643038818401. The next prime is 1643038818431. The reversal of 1643038818428 is 8248188303461.

It is a super-2 number, since 2×1643038818428² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2331050 + ... + 2952942.

It is an arithmetic number, because the mean of its divisors is an integer number (69010747988).

Almost surely, 2^{1643038818428} is an apocalyptic number.

It is an amenable number.

1643038818428 is an abundant number, since it is smaller than the sum of its proper divisors (1669477084996).

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

1643038818428 is a wasteful number, since it uses less digits than its factorization.

1643038818428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 622662 (or 622660 counting only the distinct ones).

The product of its (nonzero) digits is 7077888, while the sum is 56.

The spelling of 1643038818428 in words is "one trillion, six hundred forty-three billion, thirty-eight million, eight hundred eighteen thousand, four hundred twenty-eight".