689609340 has 216 divisors, whose sum is σ = 2493992592. Its totient is φ = 153699840.

The previous prime is 689609321. The next prime is 689609363. The reversal of 689609340 is 43906986.

689609340 is a `hidden beast` number, since 6 + 8 + 9 + 609 + 34 + 0 = 666.

689609340 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×689609340² = 951122083630471200, which contains 22 as substring.

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 polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 360667 + ... + 362573.

It is an arithmetic number, because the mean of its divisors is an integer number (11546262).

Almost surely, 2^689609340 is an apocalyptic number.

689609340 is a gapful number since it is divisible by the number (60) 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 689609340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1246996296).

689609340 is an abundant number, since it is smaller than the sum of its proper divisors (1804383252).

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

689609340 is a wasteful number, since it uses less digits than its factorization.

689609340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1977 (or 1965 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 45.

The square root of 689609340 is about 26260.4139342852. The cubic root of 689609340 is about 883.4887931758.

The spelling of 689609340 in words is "six hundred eighty-nine million, six hundred nine thousand, three hundred forty".