688448994534 has 192 divisors, whose sum is σ = 1787590771200. Its totient is φ = 187388411904.

The previous prime is 688448994521. The next prime is 688448994553. The reversal of 688448994534 is 435499844886.

688448994534 is a `hidden beast` number, since 6 + 8 + 8 + 4 + 4 + 89 + 9 + 4 + 534 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 70685037 + ... + 70694775.

It is an arithmetic number, because the mean of its divisors is an integer number (9310368600).

Almost surely, 2^688448994534 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 688448994534, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (893795385600).

688448994534 is an abundant number, since it is smaller than the sum of its proper divisors (1099141776666).

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

688448994534 is a wasteful number, since it uses less digits than its factorization.

688448994534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10107 (or 10104 counting only the distinct ones).

The product of its digits is 955514880, while the sum is 72.

The spelling of 688448994534 in words is "six hundred eighty-eight billion, four hundred forty-eight million, nine hundred ninety-four thousand, five hundred thirty-four".