639524667 has 8 divisors (see below), whose sum is σ = 897578560. Its totient is φ = 403910280.

The previous prime is 639524609. The next prime is 639524693. The reversal of 639524667 is 766425936.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 639524667 - 2¹¹ = 639522619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (639524267) 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, 5609809 + ... + 5609922.

It is an arithmetic number, because the mean of its divisors is an integer number (112197320).

Almost surely, 2^639524667 is an apocalyptic number.

639524667 is a deficient number, since it is larger than the sum of its proper divisors (258053893).

639524667 is a wasteful number, since it uses less digits than its factorization.

639524667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11219753.

The product of its digits is 1632960, while the sum is 48.

The square root of 639524667 is about 25288.8249430455. The cubic root of 639524667 is about 861.5604744423.

The spelling of 639524667 in words is "six hundred thirty-nine million, five hundred twenty-four thousand, six hundred sixty-seven".