688400298 has 12 divisors (see below), whose sum is σ = 1491534018. Its totient is φ = 229466760.

The previous prime is 688400269. The next prime is 688400299. The reversal of 688400298 is 892004886.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 390734289 + 297666009 = 19767^2 + 17253^2 .

It is not an unprimeable number, because it can be changed into a prime (688400299) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 19122213 + ... + 19122248.

Almost surely, 2^688400298 is an apocalyptic number.

688400298 is an abundant number, since it is smaller than the sum of its proper divisors (803133720).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

688400298 is a wasteful number, since it uses less digits than its factorization.

688400298 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38244469 (or 38244466 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 45.

The square root of 688400298 is about 26237.3835966927. The cubic root of 688400298 is about 882.9721722160.

The spelling of 688400298 in words is "six hundred eighty-eight million, four hundred thousand, two hundred ninety-eight".