688428220 has 24 divisors (see below), whose sum is σ = 1446210864. Its totient is φ = 275273856.

The previous prime is 688428217. The next prime is 688428229. The reversal of 688428220 is 22824886.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688428229) 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, 85279 + ... + 93001.

It is an arithmetic number, because the mean of its divisors is an integer number (60258786).

Almost surely, 2^688428220 is an apocalyptic number.

It is an amenable number.

688428220 is an abundant number, since it is smaller than the sum of its proper divisors (757782644).

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

688428220 is a wasteful number, since it uses less digits than its factorization.

688428220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12189 (or 12187 counting only the distinct ones).

The product of its (nonzero) digits is 98304, while the sum is 40.

The square root of 688428220 is about 26237.9156946584. The cubic root of 688428220 is about 882.9841100452.

The spelling of 688428220 in words is "six hundred eighty-eight million, four hundred twenty-eight thousand, two hundred twenty".