639777589 has 8 divisors (see below), whose sum is σ = 698144832. Its totient is φ = 581444640.

The previous prime is 639777587. The next prime is 639777601. The reversal of 639777589 is 985777936.

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

It is a cyclic number.

It is not a de Polignac number, because 639777589 - 2¹ = 639777587 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639777581) 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, 45057 + ... + 57529.

It is an arithmetic number, because the mean of its divisors is an integer number (87268104).

Almost surely, 2^639777589 is an apocalyptic number.

It is an amenable number.

639777589 is a deficient number, since it is larger than the sum of its proper divisors (58367243).

639777589 is a wasteful number, since it uses less digits than its factorization.

639777589 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17147.

The product of its digits is 20003760, while the sum is 61.

The square root of 639777589 is about 25293.8251160239. The cubic root of 639777589 is about 861.6740373688.

The spelling of 639777589 in words is "six hundred thirty-nine million, seven hundred seventy-seven thousand, five hundred eighty-nine".