688136272 has 20 divisors (see below), whose sum is σ = 1334658996. Its totient is φ = 343708160.

The previous prime is 688136269. The next prime is 688136347. The reversal of 688136272 is 272631886.

It can be written as a sum of positive squares in 2 ways, for example, as 490002496 + 198133776 = 22136^2 + 14076^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6379 + ... + 37642.

Almost surely, 2^688136272 is an apocalyptic number.

It is an amenable number.

688136272 is a deficient number, since it is larger than the sum of its proper divisors (646522724).

688136272 is a wasteful number, since it uses less digits than its factorization.

688136272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45006 (or 45000 counting only the distinct ones).

The product of its digits is 193536, while the sum is 43.

The square root of 688136272 is about 26232.3516292383. The cubic root of 688136272 is about 882.8592740364.

The spelling of 688136272 in words is "six hundred eighty-eight million, one hundred thirty-six thousand, two hundred seventy-two".