1689072944 has 160 divisors (see below), whose sum is σ = 4059740160. Its totient is φ = 671846400.

The previous prime is 1689072929. The next prime is 1689072947. The reversal of 1689072944 is 4492709861.

It is a junction number, because it is equal to n+sod(n) for n = 1689072892 and 1689072901.

It is not an unprimeable number, because it can be changed into a prime (1689072947) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2082299 + ... + 2083109.

It is an arithmetic number, because the mean of its divisors is an integer number (25373376).

Almost surely, 2^1689072944 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 1689072944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2029870080).

1689072944 is an abundant number, since it is smaller than the sum of its proper divisors (2370667216).

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

1689072944 is a wasteful number, since it uses less digits than its factorization.

1689072944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 899 (or 893 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 50.

The square root of 1689072944 is about 41098.3326182462. The cubic root of 1689072944 is about 1190.9205841709.

The spelling of 1689072944 in words is "one billion, six hundred eighty-nine million, seventy-two thousand, nine hundred forty-four".