688343451 has 4 divisors (see below), whose sum is σ = 917791272. Its totient is φ = 458895632.

The previous prime is 688343423. The next prime is 688343473. The reversal of 688343451 is 154343886.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 688343451 - 2¹⁴ = 688327067 is a prime.

It is not an unprimeable number, because it can be changed into a prime (688363451) 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, 114723906 + ... + 114723911.

It is an arithmetic number, because the mean of its divisors is an integer number (229447818).

Almost surely, 2^688343451 is an apocalyptic number.

688343451 is a deficient number, since it is larger than the sum of its proper divisors (229447821).

688343451 is a wasteful number, since it uses less digits than its factorization.

688343451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229447820.

The product of its digits is 276480, while the sum is 42.

The square root of 688343451 is about 26236.3002536562. The cubic root of 688343451 is about 882.9478667351.

The spelling of 688343451 in words is "six hundred eighty-eight million, three hundred forty-three thousand, four hundred fifty-one".