688134224 has 10 divisors (see below), whose sum is σ = 1333260090. Its totient is φ = 344067104.

The previous prime is 688134221. The next prime is 688134247. The reversal of 688134224 is 422431886.

It can be written as a sum of positive squares in only one way, i.e., 434305600 + 253828624 = 20840^2 + 15932^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688134221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21504179 + ... + 21504210.

It is an arithmetic number, because the mean of its divisors is an integer number (133326009).

Almost surely, 2^688134224 is an apocalyptic number.

It is an amenable number.

688134224 is a deficient number, since it is larger than the sum of its proper divisors (645125866).

688134224 is a wasteful number, since it uses less digits than its factorization.

688134224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43008397 (or 43008391 counting only the distinct ones).

The product of its digits is 73728, while the sum is 38.

The square root of 688134224 is about 26232.3125934409. The cubic root of 688134224 is about 882.8583981936.

It can be divided in two parts, 68813 and 4224, that added together give a palindrome (73037).

The spelling of 688134224 in words is "six hundred eighty-eight million, one hundred thirty-four thousand, two hundred twenty-four".