689913840 has 320 divisors, whose sum is σ = 2741253120. Its totient is φ = 139345920.

The previous prime is 689913823. The next prime is 689913853. The reversal of 689913840 is 48319986.

It is a super-3 number, since 3×689913840³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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

It is a self number, because there is not a number n which added to its sum of digits gives 689913840.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 683256 + ... + 684264.

It is an arithmetic number, because the mean of its divisors is an integer number (8566416).

Almost surely, 2^689913840 is an apocalyptic number.

689913840 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 689913840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1370626560).

689913840 is an abundant number, since it is smaller than the sum of its proper divisors (2051339280).

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

689913840 is a wasteful number, since it uses less digits than its factorization.

689913840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1080 (or 1074 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 48.

The square root of 689913840 is about 26266.2109943555. The cubic root of 689913840 is about 883.6188101461.

The spelling of 689913840 in words is "six hundred eighty-nine million, nine hundred thirteen thousand, eight hundred forty".