688139848 has 64 divisors (see below), whose sum is σ = 1441382400. Its totient is φ = 305363520.

The previous prime is 688139813. The next prime is 688139857. The reversal of 688139848 is 848931886.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 748333 + ... + 749251.

It is an arithmetic number, because the mean of its divisors is an integer number (22521600).

Almost surely, 2^688139848 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 688139848, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (720691200).

688139848 is an abundant number, since it is smaller than the sum of its proper divisors (753242552).

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

688139848 is a wasteful number, since it uses less digits than its factorization.

688139848 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1130 (or 1126 counting only the distinct ones).

The product of its digits is 2654208, while the sum is 55.

The square root of 688139848 is about 26232.4197892608. The cubic root of 688139848 is about 882.8608033359.

The spelling of 688139848 in words is "six hundred eighty-eight million, one hundred thirty-nine thousand, eight hundred forty-eight".