688748239 has 2 divisors, whose sum is σ = 688748240. Its totient is φ = 688748238.

The previous prime is 688748227. The next prime is 688748287. The reversal of 688748239 is 932847886.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 688748239 - 2¹³ = 688740047 is a prime.

It is a super-2 number, since 2×688748239² = 948748273451202242, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 688748239.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (688748539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344374119 + 344374120.

It is an arithmetic number, because the mean of its divisors is an integer number (344374120).

Almost surely, 2^688748239 is an apocalyptic number.

688748239 is a deficient number, since it is larger than the sum of its proper divisors (1).

688748239 is an equidigital number, since it uses as much as digits as its factorization.

688748239 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4644864, while the sum is 55.

The square root of 688748239 is about 26244.0133935342. The cubic root of 688748239 is about 883.1209085814.

The spelling of 688748239 in words is "six hundred eighty-eight million, seven hundred forty-eight thousand, two hundred thirty-nine".