688472329 has 4 divisors (see below), whose sum is σ = 690644484. Its totient is φ = 686300176.

The previous prime is 688472327. The next prime is 688472333. The reversal of 688472329 is 923274886.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 84640000 + 603832329 = 9200^2 + 24573^2 .

It is a cyclic number.

It is not a de Polignac number, because 688472329 - 2¹ = 688472327 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (688472327) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1085602 + ... + 1086235.

It is an arithmetic number, because the mean of its divisors is an integer number (172661121).

Almost surely, 2^688472329 is an apocalyptic number.

It is an amenable number.

688472329 is a deficient number, since it is larger than the sum of its proper divisors (2172155).

688472329 is a wasteful number, since it uses less digits than its factorization.

688472329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2172154.

The product of its digits is 1161216, while the sum is 49.

The square root of 688472329 is about 26238.7562395781. The cubic root of 688472329 is about 883.0029678400.

The spelling of 688472329 in words is "six hundred eighty-eight million, four hundred seventy-two thousand, three hundred twenty-nine".