688421488 has 40 divisors (see below), whose sum is σ = 1413503280. Its totient is φ = 324226560.

The previous prime is 688421473. The next prime is 688421501. The reversal of 688421488 is 884124886.

It is a happy number.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 931 + ... + 37117.

It is an arithmetic number, because the mean of its divisors is an integer number (35337582).

Almost surely, 2^688421488 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 688421488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (706751640).

688421488 is an abundant number, since it is smaller than the sum of its proper divisors (725081792).

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

688421488 is a wasteful number, since it uses less digits than its factorization.

688421488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36265 (or 36259 counting only the distinct ones).

The product of its digits is 786432, while the sum is 49.

The square root of 688421488 is about 26237.7874067155. The cubic root of 688421488 is about 882.9812318616.

The spelling of 688421488 in words is "six hundred eighty-eight million, four hundred twenty-one thousand, four hundred eighty-eight".