639279055 has 8 divisors (see below), whose sum is σ = 791881344. Its totient is φ = 494925600.

The previous prime is 639279041. The next prime is 639279077. The reversal of 639279055 is 550972936.

It is a happy number.

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

It is not a de Polignac number, because 639279055 - 2¹⁵ = 639246287 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 639278996 and 639279014.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2062036 + ... + 2062345.

It is an arithmetic number, because the mean of its divisors is an integer number (98985168).

Almost surely, 2^639279055 is an apocalyptic number.

639279055 is a deficient number, since it is larger than the sum of its proper divisors (152602289).

639279055 is a wasteful number, since it uses less digits than its factorization.

639279055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4124417.

The product of its (nonzero) digits is 510300, while the sum is 46.

The square root of 639279055 is about 25283.9683396416. The cubic root of 639279055 is about 861.4501650735.

The spelling of 639279055 in words is "six hundred thirty-nine million, two hundred seventy-nine thousand, fifty-five".