688407828 has 24 divisors (see below), whose sum is σ = 1615574688. Its totient is φ = 228142176.

The previous prime is 688407827. The next prime is 688407857. The reversal of 688407828 is 828704886.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688407821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 163726 + ... + 167877.

It is an arithmetic number, because the mean of its divisors is an integer number (67315612).

Almost surely, 2^688407828 is an apocalyptic number.

It is an amenable number.

688407828 is an abundant number, since it is smaller than the sum of its proper divisors (927166860).

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

688407828 is a wasteful number, since it uses less digits than its factorization.

688407828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331783 (or 331781 counting only the distinct ones).

The product of its (nonzero) digits is 1376256, while the sum is 51.

The square root of 688407828 is about 26237.5270938402. The cubic root of 688407828 is about 882.9753916394.

The spelling of 688407828 in words is "six hundred eighty-eight million, four hundred seven thousand, eight hundred twenty-eight".