688256429 has 4 divisors (see below), whose sum is σ = 786578784. Its totient is φ = 589934076.

The previous prime is 688256423. The next prime is 688256431. The reversal of 688256429 is 924652886.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-688256429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688256423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49161167 + ... + 49161180.

It is an arithmetic number, because the mean of its divisors is an integer number (196644696).

Almost surely, 2^688256429 is an apocalyptic number.

It is an amenable number.

688256429 is a deficient number, since it is larger than the sum of its proper divisors (98322355).

688256429 is an equidigital number, since it uses as much as digits as its factorization.

688256429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98322354.

The product of its digits is 1658880, while the sum is 50.

The square root of 688256429 is about 26234.6417738074. The cubic root of 688256429 is about 882.9106570509.

The spelling of 688256429 in words is "six hundred eighty-eight million, two hundred fifty-six thousand, four hundred twenty-nine".