688513738 has 32 divisors (see below), whose sum is σ = 1157732352. Its totient is φ = 304377600.

The previous prime is 688513729. The next prime is 688513741. The reversal of 688513738 is 837315886.

It is a junction number, because it is equal to n+sod(n) for n = 688513691 and 688513700.

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 15 ways as a sum of consecutive naturals, for example, 344470 + ... + 346462.

It is an arithmetic number, because the mean of its divisors is an integer number (36179136).

Almost surely, 2^688513738 is an apocalyptic number.

688513738 is a deficient number, since it is larger than the sum of its proper divisors (469218614).

688513738 is a wasteful number, since it uses less digits than its factorization.

688513738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2430.

The product of its digits is 967680, while the sum is 49.

The square root of 688513738 is about 26239.5453085605. The cubic root of 688513738 is about 883.0206705785.

The spelling of 688513738 in words is "six hundred eighty-eight million, five hundred thirteen thousand, seven hundred thirty-eight".