688785054 has 16 divisors (see below), whose sum is σ = 1391210640. Its totient is φ = 227321600.

The previous prime is 688785037. The next prime is 688785077. The reversal of 688785054 is 450587886.

It is a super-2 number, since 2×688785054² = 948849701227565832, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 688784988 and 688785006.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 567699 + ... + 568910.

It is an arithmetic number, because the mean of its divisors is an integer number (86950665).

Almost surely, 2^688785054 is an apocalyptic number.

688785054 is an abundant number, since it is smaller than the sum of its proper divisors (702425586).

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

688785054 is a wasteful number, since it uses less digits than its factorization.

688785054 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1136715.

The product of its (nonzero) digits is 2150400, while the sum is 51.

The square root of 688785054 is about 26244.7147822185. The cubic root of 688785054 is about 883.1366431731.

The spelling of 688785054 in words is "six hundred eighty-eight million, seven hundred eighty-five thousand, fifty-four".