639962026 has 32 divisors (see below), whose sum is σ = 1070107200. Its totient is φ = 284580480.

The previous prime is 639962021. The next prime is 639962033. The reversal of 639962026 is 620269936.

It is not an unprimeable number, because it can be changed into a prime (639962021) 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 in 15 ways as a sum of consecutive naturals, for example, 296166 + ... + 298318.

It is an arithmetic number, because the mean of its divisors is an integer number (33440850).

Almost surely, 2^639962026 is an apocalyptic number.

639962026 is a deficient number, since it is larger than the sum of its proper divisors (430145174).

639962026 is a wasteful number, since it uses less digits than its factorization.

639962026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2454.

The product of its (nonzero) digits is 209952, while the sum is 43.

The square root of 639962026 is about 25297.4707431395. The cubic root of 639962026 is about 861.7568314042.

The spelling of 639962026 in words is "six hundred thirty-nine million, nine hundred sixty-two thousand, twenty-six".