688826808 has 128 divisors (see below), whose sum is σ = 2045736000. Its totient is φ = 213995520.

The previous prime is 688826797. The next prime is 688826837. The reversal of 688826808 is 808628886.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 399388 + ... + 401108.

Almost surely, 2^688826808 is an apocalyptic number.

688826808 is a gapful number since it is divisible by the number (68) 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 688826808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1022868000).

688826808 is an abundant number, since it is smaller than the sum of its proper divisors (1356909192).

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

688826808 is a wasteful number, since it uses less digits than its factorization.

688826808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1862 (or 1852 counting only the distinct ones).

The product of its (nonzero) digits is 2359296, while the sum is 54.

The square root of 688826808 is about 26245.5102446114. The cubic root of 688826808 is about 883.1544879962.

The spelling of 688826808 in words is "six hundred eighty-eight million, eight hundred twenty-six thousand, eight hundred eight".