689407777 has 4 divisors (see below), whose sum is σ = 705440560. Its totient is φ = 673374996.

The previous prime is 689407759. The next prime is 689407801. The reversal of 689407777 is 777704986.

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.

It is a cyclic number.

It is not a de Polignac number, because 689407777 - 2²⁷ = 555190049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (689407577) 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, 8016327 + ... + 8016412.

It is an arithmetic number, because the mean of its divisors is an integer number (176360140).

Almost surely, 2^689407777 is an apocalyptic number.

It is an amenable number.

689407777 is a deficient number, since it is larger than the sum of its proper divisors (16032783).

689407777 is a wasteful number, since it uses less digits than its factorization.

689407777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16032782.

The product of its (nonzero) digits is 4148928, while the sum is 55.

The square root of 689407777 is about 26256.5758811007. The cubic root of 689407777 is about 883.4027077194.

The spelling of 689407777 in words is "six hundred eighty-nine million, four hundred seven thousand, seven hundred seventy-seven".