688047820 has 24 divisors (see below), whose sum is σ = 1445414544. Its totient is φ = 275121216.

The previous prime is 688047809. The next prime is 688047827. The reversal of 688047820 is 28740886.

It is not an unprimeable number, because it can be changed into a prime (688047827) 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, 83527 + ... + 91393.

It is an arithmetic number, because the mean of its divisors is an integer number (60225606).

Almost surely, 2^688047820 is an apocalyptic number.

It is an amenable number.

688047820 is an abundant number, since it is smaller than the sum of its proper divisors (757366724).

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

688047820 is a wasteful number, since it uses less digits than its factorization.

688047820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12249 (or 12247 counting only the distinct ones).

The product of its (nonzero) digits is 172032, while the sum is 43.

The square root of 688047820 is about 26230.6656415730. The cubic root of 688047820 is about 882.8214452817.

The spelling of 688047820 in words is "six hundred eighty-eight million, forty-seven thousand, eight hundred twenty".