688857842 has 8 divisors (see below), whose sum is σ = 1033406976. Its totient is φ = 344388852.

The previous prime is 688857839. The next prime is 688857853. The reversal of 688857842 is 248758886.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11183 + ... + 38765.

It is an arithmetic number, because the mean of its divisors is an integer number (129175872).

Almost surely, 2^688857842 is an apocalyptic number.

688857842 is a deficient number, since it is larger than the sum of its proper divisors (344549134).

688857842 is a wasteful number, since it uses less digits than its factorization.

688857842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40072.

The product of its digits is 6881280, while the sum is 56.

The square root of 688857842 is about 26246.1014628840. The cubic root of 688857842 is about 883.1677508389.

The spelling of 688857842 in words is "six hundred eighty-eight million, eight hundred fifty-seven thousand, eight hundred forty-two".