688874749 has 8 divisors (see below), whose sum is σ = 705401312. Its totient is φ = 672371280.

The previous prime is 688874741. The next prime is 688874759. The reversal of 688874749 is 947478886.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 688874749 - 2³ = 688874741 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 (688874741) 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 in 7 ways as a sum of consecutive naturals, for example, 64762 + ... + 74644.

It is an arithmetic number, because the mean of its divisors is an integer number (88175164).

Almost surely, 2^688874749 is an apocalyptic number.

It is an amenable number.

688874749 is a deficient number, since it is larger than the sum of its proper divisors (16526563).

688874749 is a wasteful number, since it uses less digits than its factorization.

688874749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11547.

The product of its digits is 21676032, while the sum is 61.

The square root of 688874749 is about 26246.4235468378. The cubic root of 688874749 is about 883.1749761299.

The spelling of 688874749 in words is "six hundred eighty-eight million, eight hundred seventy-four thousand, seven hundred forty-nine".