1689278540 has 24 divisors (see below), whose sum is σ = 3614420880. Its totient is φ = 662961728.

The previous prime is 1689278533. The next prime is 1689278557. The reversal of 1689278540 is 458729861.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 795770 + ... + 797889.

It is an arithmetic number, because the mean of its divisors is an integer number (150600870).

Almost surely, 2^1689278540 is an apocalyptic number.

1689278540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1689278540 is an abundant number, since it is smaller than the sum of its proper divisors (1925142340).

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

1689278540 is a wasteful number, since it uses less digits than its factorization.

1689278540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1593721 (or 1593719 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 50.

The square root of 1689278540 is about 41100.8338114934. The cubic root of 1689278540 is about 1190.9689023081.

The spelling of 1689278540 in words is "one billion, six hundred eighty-nine million, two hundred seventy-eight thousand, five hundred forty".