688434851 has 12 divisors (see below), whose sum is σ = 748063008. Its totient is φ = 633263904.

The previous prime is 688434841. The next prime is 688434853. The reversal of 688434851 is 158434886.

It is not a de Polignac number, because 688434851 - 2¹⁸ = 688172707 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 688434796 and 688434805.

It is not an unprimeable number, because it can be changed into a prime (688434853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42566 + ... + 56468.

It is an arithmetic number, because the mean of its divisors is an integer number (62338584).

Almost surely, 2^688434851 is an apocalyptic number.

688434851 is a deficient number, since it is larger than the sum of its proper divisors (59628157).

688434851 is a wasteful number, since it uses less digits than its factorization.

688434851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14222 (or 14209 counting only the distinct ones).

The product of its digits is 737280, while the sum is 47.

The square root of 688434851 is about 26238.0420572877. The cubic root of 688434851 is about 882.9869450292.

The spelling of 688434851 in words is "six hundred eighty-eight million, four hundred thirty-four thousand, eight hundred fifty-one".