689051640 has 64 divisors (see below), whose sum is σ = 2073204000. Its totient is φ = 183209472.

The previous prime is 689051639. The next prime is 689051647. The reversal of 689051640 is 46150986.

It is a super-3 number, since 3×689051640³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689051647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33654 + ... + 50106.

Almost surely, 2^689051640 is an apocalyptic number.

689051640 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 689051640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1036602000).

689051640 is an abundant number, since it is smaller than the sum of its proper divisors (1384152360).

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

689051640 is a wasteful number, since it uses less digits than its factorization.

689051640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16816 (or 16812 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 39.

The square root of 689051640 is about 26249.7931420421. The cubic root of 689051640 is about 883.2505642949.

The spelling of 689051640 in words is "six hundred eighty-nine million, fifty-one thousand, six hundred forty".