688426433 has 4 divisors (see below), whose sum is σ = 691044288. Its totient is φ = 685808580.

The previous prime is 688426429. The next prime is 688426471. The reversal of 688426433 is 334624886.

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 not a de Polignac number, because 688426433 - 2² = 688426429 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (688426483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1308533 + ... + 1309058.

It is an arithmetic number, because the mean of its divisors is an integer number (172761072).

Almost surely, 2^688426433 is an apocalyptic number.

It is an amenable number.

688426433 is a deficient number, since it is larger than the sum of its proper divisors (2617855).

688426433 is a wasteful number, since it uses less digits than its factorization.

688426433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2617854.

The product of its digits is 663552, while the sum is 44.

The square root of 688426433 is about 26237.8816408642. The cubic root of 688426433 is about 882.9833460372.

The spelling of 688426433 in words is "six hundred eighty-eight million, four hundred twenty-six thousand, four hundred thirty-three".