689408977 has 8 divisors (see below), whose sum is σ = 732353600. Its totient is φ = 647130384.

The previous prime is 689408963. The next prime is 689408983. The reversal of 689408977 is 779804986.

It is a happy number.

689408977 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 689408977 - 2⁷ = 689408849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (689408917) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 164373 + ... + 168514.

It is an arithmetic number, because the mean of its divisors is an integer number (91544200).

Almost surely, 2^689408977 is an apocalyptic number.

It is an amenable number.

689408977 is a deficient number, since it is larger than the sum of its proper divisors (42944623).

689408977 is a wasteful number, since it uses less digits than its factorization.

689408977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333015.

The product of its (nonzero) digits is 6096384, while the sum is 58.

The square root of 689408977 is about 26256.5987325091. The cubic root of 689408977 is about 883.4032202765.

The spelling of 689408977 in words is "six hundred eighty-nine million, four hundred eight thousand, nine hundred seventy-seven".