1689706980 has 120 divisors (see below), whose sum is σ = 5708488632. Its totient is φ = 415922688.

The previous prime is 1689706943. The next prime is 1689706999. The reversal of 1689706980 is 896079861.

It can be written as a sum of positive squares in 4 ways, for example, as 355850496 + 1333856484 = 18864^2 + 36522^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 19057 + ... + 61176.

Almost surely, 2^1689706980 is an apocalyptic number.

1689706980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1689706980 is an abundant number, since it is smaller than the sum of its proper divisors (4018781652).

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

1689706980 is a wasteful number, since it uses less digits than its factorization.

1689706980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80267 (or 80256 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 54.

The square root of 1689706980 is about 41106.0455407717. The cubic root of 1689706980 is about 1191.0695795248.

The spelling of 1689706980 in words is "one billion, six hundred eighty-nine million, seven hundred six thousand, nine hundred eighty".