688379652 has 72 divisors (see below), whose sum is σ = 1837486560. Its totient is φ = 216691200.

The previous prime is 688379639. The next prime is 688379663. The reversal of 688379652 is 256973886.

It is a happy number.

It is a super-2 number, since 2×688379652² = 947733090575282208, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 240027 + ... + 242877.

Almost surely, 2^688379652 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 688379652, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (918743280).

688379652 is an abundant number, since it is smaller than the sum of its proper divisors (1149106908).

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

688379652 is a wasteful number, since it uses less digits than its factorization.

688379652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3233 (or 3228 counting only the distinct ones).

The product of its digits is 4354560, while the sum is 54.

The square root of 688379652 is about 26236.9901474998. The cubic root of 688379652 is about 882.9633449751.

The spelling of 688379652 in words is "six hundred eighty-eight million, three hundred seventy-nine thousand, six hundred fifty-two".