1689742620 has 240 divisors, whose sum is σ = 5495390208. Its totient is φ = 434367360.

The previous prime is 1689742589. The next prime is 1689742643. The reversal of 1689742620 is 262479861.

It is a happy number.

1689742620 is a `hidden beast` number, since 16 + 8 + 9 + 7 + 4 + 2 + 620 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 8846725 + ... + 8846915.

Almost surely, 2^1689742620 is an apocalyptic number.

1689742620 is a gapful number since it is divisible by the number (10) 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 1689742620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2747695104).

1689742620 is an abundant number, since it is smaller than the sum of its proper divisors (3805647588).

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

1689742620 is a wasteful number, since it uses less digits than its factorization.

1689742620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 382 (or 371 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The square root of 1689742620 is about 41106.4790513612. The cubic root of 1689742620 is about 1191.0779536437.

The spelling of 1689742620 in words is "one billion, six hundred eighty-nine million, seven hundred forty-two thousand, six hundred twenty".