688222756 has 27 divisors (see below), whose sum is σ = 1305455571. Its totient is φ = 317326464.

The previous prime is 688222741. The next prime is 688222763. The reversal of 688222756 is 657222886.

The square root of 688222756 is 26234.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 212284900 + 475937856 = 14570^2 + 21816^2 .

It is a Duffinian number.

Its product of digits (645120) is a multiple of the sum of its prime divisors (1024).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 681580 + ... + 682588.

Almost surely, 2^688222756 is an apocalyptic number.

688222756 is the 26234-th square number.

It is an amenable number.

688222756 is a deficient number, since it is larger than the sum of its proper divisors (617232815).

688222756 is a wasteful number, since it uses less digits than its factorization.

688222756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2048 (or 1024 counting only the distinct ones).

The product of its digits is 645120, while the sum is 46.

The cubic root of 688222756 is about 882.8962579915.

The spelling of 688222756 in words is "six hundred eighty-eight million, two hundred twenty-two thousand, seven hundred fifty-six".