1689608786628 has 144 divisors (see below), whose sum is σ = 4720846040064. Its totient is φ = 468694094400.

The previous prime is 1689608786581. The next prime is 1689608786633. The reversal of 1689608786628 is 8266878069861.

It is a super-2 number, since 2×1689608786628² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1689608786628.

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, 4022353 + ... + 4422503.

It is an arithmetic number, because the mean of its divisors is an integer number (32783653056).

Almost surely, 2^{1689608786628} 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 1689608786628, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2360423020032).

1689608786628 is an abundant number, since it is smaller than the sum of its proper divisors (3031237253436).

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

1689608786628 is a wasteful number, since it uses less digits than its factorization.

1689608786628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400382 (or 400373 counting only the distinct ones).

The product of its (nonzero) digits is 668860416, while the sum is 75.

The spelling of 1689608786628 in words is "one trillion, six hundred eighty-nine billion, six hundred eight million, seven hundred eighty-six thousand, six hundred twenty-eight".