688240273 has 8 divisors (see below), whose sum is σ = 787860992. Its totient is φ = 588944736.

The previous prime is 688240271. The next prime is 688240297. The reversal of 688240273 is 372042886.

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

It is a cyclic number.

It is not a de Polignac number, because 688240273 - 2¹ = 688240271 is a prime.

It is a super-2 number, since 2×688240273² = 947349346758229058, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (688240271) 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 7 ways as a sum of consecutive naturals, for example, 76740 + ... + 85237.

It is an arithmetic number, because the mean of its divisors is an integer number (98482624).

Almost surely, 2^688240273 is an apocalyptic number.

It is an amenable number.

688240273 is a deficient number, since it is larger than the sum of its proper divisors (99620719).

688240273 is a wasteful number, since it uses less digits than its factorization.

688240273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162591.

The product of its (nonzero) digits is 129024, while the sum is 40.

The square root of 688240273 is about 26234.3338585145. Note that the first 3 decimals coincide. The cubic root of 688240273 is about 882.9037485714.

The spelling of 688240273 in words is "six hundred eighty-eight million, two hundred forty thousand, two hundred seventy-three".