1689550229928 has 128 divisors (see below), whose sum is σ = 4851316339200. Its totient is φ = 484945056000.

The previous prime is 1689550229903. The next prime is 1689550229957. The reversal of 1689550229928 is 8299220559861.

It is a Cunningham number, because it is equal to 1299827²-1.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28566675 + ... + 28625757.

It is an arithmetic number, because the mean of its divisors is an integer number (37900908900).

Almost surely, 2^{1689550229928} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1689550229928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2425658169600).

1689550229928 is an abundant number, since it is smaller than the sum of its proper divisors (3161766109272).

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

1689550229928 is a wasteful number, since it uses less digits than its factorization.

1689550229928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64823 (or 64819 counting only the distinct ones).

The product of its (nonzero) digits is 55987200, while the sum is 66.

The spelling of 1689550229928 in words is "one trillion, six hundred eighty-nine billion, five hundred fifty million, two hundred twenty-nine thousand, nine hundred twenty-eight".