639676283 has 2 divisors, whose sum is σ = 639676284. Its totient is φ = 639676282.

The previous prime is 639676277. The next prime is 639676291. The reversal of 639676283 is 382676936.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 639676283 - 2¹⁴ = 639659899 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (639676223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319838141 + 319838142.

It is an arithmetic number, because the mean of its divisors is an integer number (319838142).

Almost surely, 2^639676283 is an apocalyptic number.

639676283 is a deficient number, since it is larger than the sum of its proper divisors (1).

639676283 is an equidigital number, since it uses as much as digits as its factorization.

639676283 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1959552, while the sum is 50.

The square root of 639676283 is about 25291.8224531171. The cubic root of 639676283 is about 861.6285541887.

The spelling of 639676283 in words is "six hundred thirty-nine million, six hundred seventy-six thousand, two hundred eighty-three".