688138352 has 40 divisors (see below), whose sum is σ = 1531032960. Its totient is φ = 296326080.

The previous prime is 688138271. The next prime is 688138387. The reversal of 688138352 is 253831886.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 99548 + ... + 106235.

It is an arithmetic number, because the mean of its divisors is an integer number (38275824).

Almost surely, 2^688138352 is an apocalyptic number.

It is an amenable number.

688138352 is an abundant number, since it is smaller than the sum of its proper divisors (842894608).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

688138352 is a wasteful number, since it uses less digits than its factorization.

688138352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205821 (or 205815 counting only the distinct ones).

The product of its digits is 276480, while the sum is 44.

The square root of 688138352 is about 26232.3912749105. The cubic root of 688138352 is about 882.8601635625.

The spelling of 688138352 in words is "six hundred eighty-eight million, one hundred thirty-eight thousand, three hundred fifty-two".