688260042 has 12 divisors (see below), whose sum is σ = 1491230130. Its totient is φ = 229420008.

The previous prime is 688260037. The next prime is 688260043. The reversal of 688260042 is 240062886.

688260042 is a `hidden beast` number, since 6 + 8 + 8 + 2 + 600 + 42 = 666.

It can be written as a sum of positive squares in only one way, i.e., 578450601 + 109809441 = 24051^2 + 10479^2 .

It is a junction number, because it is equal to n+sod(n) for n = 688259979 and 688260006.

It is not an unprimeable number, because it can be changed into a prime (688260043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 19118317 + ... + 19118352.

Almost surely, 2^688260042 is an apocalyptic number.

688260042 is an abundant number, since it is smaller than the sum of its proper divisors (802970088).

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

688260042 is a wasteful number, since it uses less digits than its factorization.

688260042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38236677 (or 38236674 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 36.

The square root of 688260042 is about 26234.7106330525. The cubic root of 688260042 is about 882.9122019937.

The spelling of 688260042 in words is "six hundred eighty-eight million, two hundred sixty thousand, forty-two".