639324445 has 32 divisors (see below), whose sum is σ = 851316480. Its totient is φ = 458726400.

The previous prime is 639324431. The next prime is 639324449. The reversal of 639324445 is 544423936.

It is not a de Polignac number, because 639324445 - 2⁷ = 639324317 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 639324398 and 639324407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639324449) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 219237 + ... + 222133.

It is an arithmetic number, because the mean of its divisors is an integer number (26603640).

Almost surely, 2^639324445 is an apocalyptic number.

It is an amenable number.

639324445 is a deficient number, since it is larger than the sum of its proper divisors (211992035).

639324445 is a wasteful number, since it uses less digits than its factorization.

639324445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3045.

The product of its digits is 311040, while the sum is 40.

The square root of 639324445 is about 25284.8659280606. The cubic root of 639324445 is about 861.4705527782.

The spelling of 639324445 in words is "six hundred thirty-nine million, three hundred twenty-four thousand, four hundred forty-five".