639754646 has 8 divisors (see below), whose sum is σ = 959759064. Its totient is φ = 319834960.

The previous prime is 639754631. The next prime is 639754649. The reversal of 639754646 is 646457936.

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 639754594 and 639754603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639754649) 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 3 ways as a sum of consecutive naturals, for example, 3401 + ... + 35931.

It is an arithmetic number, because the mean of its divisors is an integer number (119969883).

Almost surely, 2^639754646 is an apocalyptic number.

639754646 is a deficient number, since it is larger than the sum of its proper divisors (320004418).

639754646 is a wasteful number, since it uses less digits than its factorization.

639754646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42366.

The product of its digits is 3265920, while the sum is 50.

The square root of 639754646 is about 25293.3715822940. The cubic root of 639754646 is about 861.6637371102.

The spelling of 639754646 in words is "six hundred thirty-nine million, seven hundred fifty-four thousand, six hundred forty-six".