688137982 has 16 divisors (see below), whose sum is σ = 1191828960. Its totient is φ = 291875328.

The previous prime is 688137979. The next prime is 688137997. The reversal of 688137982 is 289731886.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 252007 + ... + 254722.

It is an arithmetic number, because the mean of its divisors is an integer number (74489310).

Almost surely, 2^688137982 is an apocalyptic number.

688137982 is a deficient number, since it is larger than the sum of its proper divisors (503690978).

688137982 is a wasteful number, since it uses less digits than its factorization.

688137982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506835.

The product of its digits is 1161216, while the sum is 52.

The square root of 688137982 is about 26232.3842225597. The cubic root of 688137982 is about 882.8600053296.

The spelling of 688137982 in words is "six hundred eighty-eight million, one hundred thirty-seven thousand, nine hundred eighty-two".