639005098 has 4 divisors (see below), whose sum is σ = 958507650. Its totient is φ = 319502548.

The previous prime is 639005039. The next prime is 639005117. The reversal of 639005098 is 890500936.

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., 334048729 + 304956369 = 18277^2 + 17463^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 639005098.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159751273 + ... + 159751276.

Almost surely, 2^639005098 is an apocalyptic number.

639005098 is a deficient number, since it is larger than the sum of its proper divisors (319502552).

639005098 is a wasteful number, since it uses less digits than its factorization.

639005098 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319502551.

The product of its (nonzero) digits is 58320, while the sum is 40.

The square root of 639005098 is about 25278.5501562095. The cubic root of 639005098 is about 861.3270920478.

The spelling of 639005098 in words is "six hundred thirty-nine million, five thousand, ninety-eight".