689676428647 has 4 divisors (see below), whose sum is σ = 689755646776. Its totient is φ = 689597210520.

The previous prime is 689676428633. The next prime is 689676428677. The reversal of 689676428647 is 746824676986.

It is a happy number.

689676428647 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 is a cyclic number.

It is not a de Polignac number, because 689676428647 - 2²⁷ = 689542210919 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 689676428647.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689676428677) 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, 39596004 + ... + 39613417.

It is an arithmetic number, because the mean of its divisors is an integer number (172438911694).

Almost surely, 2^689676428647 is an apocalyptic number.

689676428647 is a deficient number, since it is larger than the sum of its proper divisors (79218129).

689676428647 is an equidigital number, since it uses as much as digits as its factorization.

689676428647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79218128.

The product of its digits is 1170505728, while the sum is 73.

The spelling of 689676428647 in words is "six hundred eighty-nine billion, six hundred seventy-six million, four hundred twenty-eight thousand, six hundred forty-seven".