688356243 has 6 divisors (see below), whose sum is σ = 994292364. Its totient is φ = 458904156.

The previous prime is 688356241. The next prime is 688356283. The reversal of 688356243 is 342653886.

It is a happy number.

688356243 is a `hidden beast` number, since 6 + 8 + 83 + 562 + 4 + 3 = 666.

It is not a de Polignac number, because 688356243 - 2¹ = 688356241 is a prime.

It is not an unprimeable number, because it can be changed into a prime (688356241) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 38242005 + ... + 38242022.

It is an arithmetic number, because the mean of its divisors is an integer number (165715394).

Almost surely, 2^688356243 is an apocalyptic number.

688356243 is a deficient number, since it is larger than the sum of its proper divisors (305936121).

688356243 is a wasteful number, since it uses less digits than its factorization.

688356243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76484033 (or 76484030 counting only the distinct ones).

The product of its digits is 829440, while the sum is 45.

The square root of 688356243 is about 26236.5440368963. The cubic root of 688356243 is about 882.9533361942.

It can be divided in two parts, 68835 and 6243, that added together give a triangular number (75078 = T₃₈₇).

The spelling of 688356243 in words is "six hundred eighty-eight million, three hundred fifty-six thousand, two hundred forty-three".