639196674 has 16 divisors (see below), whose sum is σ = 1299351360. Its totient is φ = 209572560.

The previous prime is 639196673. The next prime is 639196697. The reversal of 639196674 is 476691936.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (639196673) 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, 872854 + ... + 873585.

It is an arithmetic number, because the mean of its divisors is an integer number (81209460).

Almost surely, 2^639196674 is an apocalyptic number.

639196674 is an abundant number, since it is smaller than the sum of its proper divisors (660154686).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

639196674 is a wasteful number, since it uses less digits than its factorization.

639196674 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1746505.

The product of its digits is 1469664, while the sum is 51.

The square root of 639196674 is about 25282.3391718409. The cubic root of 639196674 is about 861.4131597553.

The spelling of 639196674 in words is "six hundred thirty-nine million, one hundred ninety-six thousand, six hundred seventy-four".