688256423 has 2 divisors, whose sum is σ = 688256424. Its totient is φ = 688256422.

The previous prime is 688256377. The next prime is 688256431. The reversal of 688256423 is 324652886.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 688256423 - 2¹⁴ = 688240039 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (681256423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344128211 + 344128212.

It is an arithmetic number, because the mean of its divisors is an integer number (344128212).

Almost surely, 2^688256423 is an apocalyptic number.

688256423 is a deficient number, since it is larger than the sum of its proper divisors (1).

688256423 is an equidigital number, since it uses as much as digits as its factorization.

688256423 is an evil number, because the sum of its binary digits is even.

The product of its digits is 552960, while the sum is 44.

The square root of 688256423 is about 26234.6416594548. The cubic root of 688256423 is about 882.9106544852.

The spelling of 688256423 in words is "six hundred eighty-eight million, two hundred fifty-six thousand, four hundred twenty-three".