688120052 has 12 divisors (see below), whose sum is σ = 1215258660. Its totient is φ = 340903296.

The previous prime is 688120021. The next prime is 688120057. The reversal of 688120052 is 250021886.

It can be written as a sum of positive squares in 2 ways, for example, as 218271076 + 469848976 = 14774^2 + 21676^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688120057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 788693 + ... + 789564.

It is an arithmetic number, because the mean of its divisors is an integer number (101271555).

Almost surely, 2^688120052 is an apocalyptic number.

It is an amenable number.

688120052 is a deficient number, since it is larger than the sum of its proper divisors (527138608).

688120052 is a wasteful number, since it uses less digits than its factorization.

688120052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1578370 (or 1578368 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 32.

The square root of 688120052 is about 26232.0424671812. The cubic root of 688120052 is about 882.8523373823.

The spelling of 688120052 in words is "six hundred eighty-eight million, one hundred twenty thousand, fifty-two".