689624640 has 336 divisors, whose sum is σ = 2567635200. Its totient is φ = 169365504.

The previous prime is 689624603. The next prime is 689624651. The reversal of 689624640 is 46426986.

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

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1920781 + ... + 1921139.

Almost surely, 2^689624640 is an apocalyptic number.

689624640 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 689624640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1283817600).

689624640 is an abundant number, since it is smaller than the sum of its proper divisors (1878010560).

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

689624640 is a wasteful number, since it uses less digits than its factorization.

689624640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434 (or 421 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 45.

The square root of 689624640 is about 26260.7052456708. The cubic root of 689624640 is about 883.4953269614.

The spelling of 689624640 in words is "six hundred eighty-nine million, six hundred twenty-four thousand, six hundred forty".