688276669 has 4 divisors (see below), whose sum is σ = 688396860. Its totient is φ = 688156480.

The previous prime is 688276651. The next prime is 688276697. The reversal of 688276669 is 966672886.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 642876025 + 45400644 = 25355^2 + 6738^2 .

It is a cyclic number.

It is not a de Polignac number, because 688276669 - 2²⁷ = 554058941 is a prime.

It is a super-2 number, since 2×688276669² = 947449546179471122, 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 (688276609) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 51052 + ... + 63109.

It is an arithmetic number, because the mean of its divisors is an integer number (172099215).

Almost surely, 2^688276669 is an apocalyptic number.

It is an amenable number.

688276669 is a deficient number, since it is larger than the sum of its proper divisors (120191).

688276669 is a wasteful number, since it uses less digits than its factorization.

688276669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120190.

The product of its digits is 10450944, while the sum is 58.

The square root of 688276669 is about 26235.0275204735. The cubic root of 688276669 is about 882.9193117401.

The spelling of 688276669 in words is "six hundred eighty-eight million, two hundred seventy-six thousand, six hundred sixty-nine".