688126381 has 8 divisors (see below), whose sum is σ = 710238240. Its totient is φ = 666362928.

The previous prime is 688126367. The next prime is 688126393. The reversal of 688126381 is 183621886.

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 688126381 - 2²¹ = 686029229 is a prime.

It is a super-2 number, since 2×688126381² = 947035832456314322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688126081) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83086 + ... + 90991.

It is an arithmetic number, because the mean of its divisors is an integer number (88779780).

Almost surely, 2^688126381 is an apocalyptic number.

It is an amenable number.

688126381 is a deficient number, since it is larger than the sum of its proper divisors (22111859).

688126381 is a wasteful number, since it uses less digits than its factorization.

688126381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174203.

The product of its digits is 110592, while the sum is 43.

The square root of 688126381 is about 26232.1631018107. The cubic root of 688126381 is about 882.8550440589.

The spelling of 688126381 in words is "six hundred eighty-eight million, one hundred twenty-six thousand, three hundred eighty-one".