688999431 has 8 divisors (see below), whose sum is σ = 958608000. Its totient is φ = 439361912.

The previous prime is 688999387. The next prime is 688999433. The reversal of 688999431 is 134999886.

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 688999431 - 2⁷ = 688999303 is a prime.

It is a super-2 number, since 2×688999431² = 949440431836647522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688999433) 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 7 ways as a sum of consecutive naturals, for example, 4992681 + ... + 4992818.

It is an arithmetic number, because the mean of its divisors is an integer number (119826000).

Almost surely, 2^688999431 is an apocalyptic number.

688999431 is a deficient number, since it is larger than the sum of its proper divisors (269608569).

688999431 is a wasteful number, since it uses less digits than its factorization.

688999431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9985525.

The product of its digits is 3359232, while the sum is 57.

The square root of 688999431 is about 26248.7986582243. The cubic root of 688999431 is about 883.2282559555.

The spelling of 688999431 in words is "six hundred eighty-eight million, nine hundred ninety-nine thousand, four hundred thirty-one".