639547280089 has 27 divisors (see below), whose sum is σ = 663672124479. Its totient is φ = 616293908880.

The previous prime is 639547280077. The next prime is 639547280137. The reversal of 639547280089 is 980082745936.

The square root of 639547280089 is 799717.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 461047790025 + 178499490064 = 679005^2 + 422492^2 .

It is not a de Polignac number, because 639547280089 - 2²⁵ = 639513725657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (639547280689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 3348414984 + ... + 3348415174.

Almost surely, 2^639547280089 is an apocalyptic number.

639547280089 is the 799717-th square number.

639547280089 is the 399859-th centered octagonal number.

It is an amenable number.

639547280089 is a deficient number, since it is larger than the sum of its proper divisors (24124844390).

639547280089 is an frugal number, since it uses more digits than its factorization.

639547280089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 646 (or 323 counting only the distinct ones).

The product of its (nonzero) digits is 26127360, while the sum is 61.

The spelling of 639547280089 in words is "six hundred thirty-nine billion, five hundred forty-seven million, two hundred eighty thousand, eighty-nine".