1689018816 has 56 divisors (see below), whose sum is σ = 4731745680. Its totient is φ = 529887232.

The previous prime is 1689018811. The next prime is 1689018827. The reversal of 1689018816 is 6188109861.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1689018811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 255471 + ... + 261998.

Almost surely, 2^1689018816 is an apocalyptic number.

1689018816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1689018816 is an abundant number, since it is smaller than the sum of its proper divisors (3042726864).

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

1689018816 is a wasteful number, since it uses less digits than its factorization.

1689018816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 517501 (or 517491 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 48.

The square root of 1689018816 is about 41097.6740947709. The cubic root of 1689018816 is about 1190.9078626288.

The spelling of 1689018816 in words is "one billion, six hundred eighty-nine million, eighteen thousand, eight hundred sixteen".