688224361 has 4 divisors (see below), whose sum is σ = 750790224. Its totient is φ = 625658500.

The previous prime is 688224359. The next prime is 688224367. The reversal of 688224361 is 163422886.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 688224361 - 2¹ = 688224359 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (688224367) 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, 31282915 + ... + 31282936.

It is an arithmetic number, because the mean of its divisors is an integer number (187697556).

Almost surely, 2^688224361 is an apocalyptic number.

It is an amenable number.

688224361 is a deficient number, since it is larger than the sum of its proper divisors (62565863).

688224361 is a wasteful number, since it uses less digits than its factorization.

688224361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62565862.

The product of its digits is 110592, while the sum is 40.

The square root of 688224361 is about 26234.0305900561. The cubic root of 688224361 is about 882.8969443233.

The spelling of 688224361 in words is "six hundred eighty-eight million, two hundred twenty-four thousand, three hundred sixty-one".