688563877 has 4 divisors (see below), whose sum is σ = 690051520. Its totient is φ = 687076236.

The previous prime is 688563871. The next prime is 688563899. The reversal of 688563877 is 778365886.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 778365886 = 2 ⋅389182943.

It is a cyclic number.

It is not a de Polignac number, because 688563877 - 2⁷ = 688563749 is a prime.

It is a super-2 number, since 2×688563877² = 948240425418542258, 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 (688563871) 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, 743127 + ... + 744052.

It is an arithmetic number, because the mean of its divisors is an integer number (172512880).

Almost surely, 2^688563877 is an apocalyptic number.

It is an amenable number.

688563877 is a deficient number, since it is larger than the sum of its proper divisors (1487643).

688563877 is a wasteful number, since it uses less digits than its factorization.

688563877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1487642.

The product of its digits is 13547520, while the sum is 58.

The square root of 688563877 is about 26240.5007002534. The cubic root of 688563877 is about 883.0421045245.

The spelling of 688563877 in words is "six hundred eighty-eight million, five hundred sixty-three thousand, eight hundred seventy-seven".