688222040 has 64 divisors (see below), whose sum is σ = 1695548160. Its totient is φ = 249333120.

The previous prime is 688222039. The next prime is 688222091. The reversal of 688222040 is 40222886.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 688221988 and 688222006.

It is a congruent number.

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, 121757 + ... + 127283.

It is an arithmetic number, because the mean of its divisors is an integer number (26492940).

Almost surely, 2^688222040 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 688222040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (847774080).

688222040 is an abundant number, since it is smaller than the sum of its proper divisors (1007326120).

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

688222040 is a wasteful number, since it uses less digits than its factorization.

688222040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5832 (or 5828 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 32.

The square root of 688222040 is about 26233.9863535834. The cubic root of 688222040 is about 882.8959518145.

The spelling of 688222040 in words is "six hundred eighty-eight million, two hundred twenty-two thousand, forty".