688271390 has 16 divisors (see below), whose sum is σ = 1304093520. Its totient is φ = 260818560.

The previous prime is 688271359. The next prime is 688271449. The reversal of 688271390 is 93172886.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1811051 + ... + 1811430.

It is an arithmetic number, because the mean of its divisors is an integer number (81505845).

Almost surely, 2^688271390 is an apocalyptic number.

688271390 is a deficient number, since it is larger than the sum of its proper divisors (615822130).

688271390 is a wasteful number, since it uses less digits than its factorization.

688271390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3622507.

The product of its (nonzero) digits is 145152, while the sum is 44.

The square root of 688271390 is about 26234.9269105138. The cubic root of 688271390 is about 882.9170544390.

The spelling of 688271390 in words is "six hundred eighty-eight million, two hundred seventy-one thousand, three hundred ninety".