689441739840 has 1344 divisors, whose sum is σ = 2933266452480. Its totient is φ = 145152000000.

The previous prime is 689441739827. The next prime is 689441739841. The reversal of 689441739840 is 48937144986.

689441739840 is a `hidden beast` number, since 6 + 8 + 94 + 417 + 3 + 98 + 40 = 666.

It is a tau number, because it is divible by the number of its divisors (1344).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (689441739841) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 2746779715 + ... + 2746779965.

It is an arithmetic number, because the mean of its divisors is an integer number (2182489920).

Almost surely, 2^689441739840 is an apocalyptic number.

689441739840 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 689441739840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1466633226240).

689441739840 is an abundant number, since it is smaller than the sum of its proper divisors (2243824712640).

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

689441739840 is a wasteful number, since it uses less digits than its factorization.

689441739840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 472 (or 459 counting only the distinct ones).

The product of its (nonzero) digits is 41803776, while the sum is 63.

The spelling of 689441739840 in words is "six hundred eighty-nine billion, four hundred forty-one million, seven hundred thirty-nine thousand, eight hundred forty".