639282274 has 4 divisors (see below), whose sum is σ = 958923414. Its totient is φ = 319641136.

The previous prime is 639282271. The next prime is 639282289. The reversal of 639282274 is 472282936.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 612315025 + 26967249 = 24745^2 + 5193^2 .

It is a super-2 number, since 2×639282274² = 817363651701222152, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 639282274.

It is not an unprimeable number, because it can be changed into a prime (639282271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159820567 + ... + 159820570.

Almost surely, 2^639282274 is an apocalyptic number.

639282274 is a deficient number, since it is larger than the sum of its proper divisors (319641140).

639282274 is a wasteful number, since it uses less digits than its factorization.

639282274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319641139.

The product of its digits is 290304, while the sum is 43.

The square root of 639282274 is about 25284.0319964993. The cubic root of 639282274 is about 861.4516109749.

The spelling of 639282274 in words is "six hundred thirty-nine million, two hundred eighty-two thousand, two hundred seventy-four".