688961852 has 6 divisors (see below), whose sum is σ = 1205683248. Its totient is φ = 344480924.

The previous prime is 688961851. The next prime is 688961857. The reversal of 688961852 is 258169886.

It is a super-2 number, since 2×688961852² = 949336867022539808, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 688961794 and 688961803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688961851) 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 as a sum of consecutive naturals, namely, 86120228 + ... + 86120235.

It is an arithmetic number, because the mean of its divisors is an integer number (200947208).

Almost surely, 2^688961852 is an apocalyptic number.

It is an amenable number.

688961852 is a deficient number, since it is larger than the sum of its proper divisors (516721396).

688961852 is a wasteful number, since it uses less digits than its factorization.

688961852 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172240467 (or 172240465 counting only the distinct ones).

The product of its digits is 1658880, while the sum is 53.

The square root of 688961852 is about 26248.0828252274. The cubic root of 688961852 is about 883.2121981590.

The spelling of 688961852 in words is "six hundred eighty-eight million, nine hundred sixty-one thousand, eight hundred fifty-two".