689378677 has 4 divisors (see below), whose sum is σ = 742407820. Its totient is φ = 636349536.

The previous prime is 689378663. The next prime is 689378693. The reversal of 689378677 is 776873986.

689378677 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 81558961 + 607819716 = 9031^2 + 24654^2 .

It is a cyclic number.

It is not a de Polignac number, because 689378677 - 2⁷ = 689378549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689378647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26514552 + ... + 26514577.

It is an arithmetic number, because the mean of its divisors is an integer number (185601955).

Almost surely, 2^689378677 is an apocalyptic number.

It is an amenable number.

689378677 is a deficient number, since it is larger than the sum of its proper divisors (53029143).

689378677 is a wasteful number, since it uses less digits than its factorization.

689378677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53029142.

The product of its digits is 21337344, while the sum is 61.

The square root of 689378677 is about 26256.0217283579. The cubic root of 689378677 is about 883.3902780267.

The spelling of 689378677 in words is "six hundred eighty-nine million, three hundred seventy-eight thousand, six hundred seventy-seven".