1689612372 has 120 divisors (see below), whose sum is σ = 5068448000. Its totient is φ = 480790080.

The previous prime is 1689612359. The next prime is 1689612377. The reversal of 1689612372 is 2732169861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1689612377) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 613254 + ... + 616002.

Almost surely, 2^1689612372 is an apocalyptic number.

1689612372 is a gapful number since it is divisible by the number (12) 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 1689612372, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2534224000).

1689612372 is an abundant number, since it is smaller than the sum of its proper divisors (3378835628).

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

1689612372 is a wasteful number, since it uses less digits than its factorization.

1689612372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3043 (or 3032 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 1689612372 is about 41104.8947450301. The cubic root of 1689612372 is about 1191.0473494744.

The spelling of 1689612372 in words is "one billion, six hundred eighty-nine million, six hundred twelve thousand, three hundred seventy-two".