688498 has 4 divisors (see below), whose sum is σ = 1032750. Its totient is φ = 344248.

The previous prime is 688477. The next prime is 688511. The reversal of 688498 is 894886.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 894886 = 2 ⋅447443.

It can be written as a sum of positive squares in only one way, i.e., 651249 + 37249 = 807^2 + 193^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172123 + ... + 172126.

2⁶⁸⁸⁴⁹⁸ is an apocalyptic number.

688498 is a deficient number, since it is larger than the sum of its proper divisors (344252).

688498 is a wasteful number, since it uses less digits than its factorization.

688498 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344251.

The product of its digits is 110592, while the sum is 43.

The square root of 688498 is about 829.7577959863. The cubic root of 688498 is about 88.3013942519.

The spelling of 688498 in words is "six hundred eighty-eight thousand, four hundred ninety-eight".