389889661728 has 288 divisors, whose sum is σ = 1326940574400. Its totient is φ = 99325771776.

The previous prime is 389889661717. The next prime is 389889661771. The reversal of 389889661728 is 827166988983.

It is a self number, because there is not a number n which added to its sum of digits gives 389889661728.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1391088 + ... + 1647696.

It is an arithmetic number, because the mean of its divisors is an integer number (4607432550).

Almost surely, 2^389889661728 is an apocalyptic number.

389889661728 is a gapful number since it is divisible by the number (38) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 389889661728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (663470287200).

389889661728 is an abundant number, since it is smaller than the sum of its proper divisors (937050912672).

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

389889661728 is a wasteful number, since it uses less digits than its factorization.

389889661728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256672 (or 256657 counting only the distinct ones).

The product of its digits is 501645312, while the sum is 75.

The spelling of 389889661728 in words is "three hundred eighty-nine billion, eight hundred eighty-nine million, six hundred sixty-one thousand, seven hundred twenty-eight".