688370085 has 24 divisors (see below), whose sum is σ = 1284958584. Its totient is φ = 338889600.

The previous prime is 688370047. The next prime is 688370093. The reversal of 688370085 is 580073886.

It can be written as a sum of positive squares in 4 ways, for example, as 567009 + 687803076 = 753^2 + 26226^2 .

It is not a de Polignac number, because 688370085 - 2⁶ = 688370021 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 688370085.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 587766 + ... + 588935.

It is an arithmetic number, because the mean of its divisors is an integer number (53539941).

Almost surely, 2^688370085 is an apocalyptic number.

688370085 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

688370085 is a deficient number, since it is larger than the sum of its proper divisors (596588499).

688370085 is a wasteful number, since it uses less digits than its factorization.

688370085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1176725 (or 1176722 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 45.

The square root of 688370085 is about 26236.8078279352. The cubic root of 688370085 is about 882.9592545242.

The spelling of 688370085 in words is "six hundred eighty-eight million, three hundred seventy thousand, eighty-five".