688226820 has 48 divisors (see below), whose sum is σ = 1974043008. Its totient is φ = 179050240.

The previous prime is 688226809. The next prime is 688226849. The reversal of 688226820 is 28622886.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 137424 + ... + 142343.

It is an arithmetic number, because the mean of its divisors is an integer number (41125896).

Almost surely, 2^688226820 is an apocalyptic number.

688226820 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

688226820 is an abundant number, since it is smaller than the sum of its proper divisors (1285816188).

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

688226820 is a wasteful number, since it uses less digits than its factorization.

688226820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279820 (or 279818 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 42.

The square root of 688226820 is about 26234.0774566212. The cubic root of 688226820 is about 882.8979958413.

The spelling of 688226820 in words is "six hundred eighty-eight million, two hundred twenty-six thousand, eight hundred twenty".