688474 has 4 divisors (see below), whose sum is σ = 1032714. Its totient is φ = 344236.

The previous prime is 688453. The next prime is 688477. The reversal of 688474 is 474886.

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

It can be written as a sum of positive squares in only one way, i.e., 378225 + 310249 = 615^2 + 557^2 .

It is a zygodrome in base 4.

It is not an unprimeable number, because it can be changed into a prime (688477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172117 + ... + 172120.

2⁶⁸⁸⁴⁷⁴ is an apocalyptic number.

688474 is a deficient number, since it is larger than the sum of its proper divisors (344240).

688474 is a wasteful number, since it uses less digits than its factorization.

688474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344239.

The product of its digits is 43008, while the sum is 37.

The square root of 688474 is about 829.7433338087. The cubic root of 688474 is about 88.3003682222.

The spelling of 688474 in words is "six hundred eighty-eight thousand, four hundred seventy-four".