639849010 has 16 divisors (see below), whose sum is σ = 1152639576. Its totient is φ = 255737088.

The previous prime is 639848971. The next prime is 639849017. The reversal of 639849010 is 10948936.

It can be written as a sum of positive squares in 4 ways, for example, as 596776041 + 43072969 = 24429^2 + 6563^2 .

It is not an unprimeable number, because it can be changed into a prime (639849017) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11697 + ... + 37636.

Almost surely, 2^639849010 is an apocalyptic number.

639849010 is a deficient number, since it is larger than the sum of its proper divisors (512790566).

639849010 is a wasteful number, since it uses less digits than its factorization.

639849010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50637.

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 639849010 is about 25295.2369034172. The cubic root of 639849010 is about 861.7061002463.

The spelling of 639849010 in words is "six hundred thirty-nine million, eight hundred forty-nine thousand, ten".