639615345 has 8 divisors (see below), whose sum is σ = 1023384576. Its totient is φ = 341128176.

The previous prime is 639615323. The next prime is 639615359. The reversal of 639615345 is 543516936.

639615345 is digitally balanced in base 2 and base 6, because in such bases it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 639615345 - 2¹⁰ = 639614321 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 639615297 and 639615306.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21320497 + ... + 21320526.

It is an arithmetic number, because the mean of its divisors is an integer number (127923072).

Almost surely, 2^639615345 is an apocalyptic number.

It is an amenable number.

639615345 is a deficient number, since it is larger than the sum of its proper divisors (383769231).

639615345 is a wasteful number, since it uses less digits than its factorization.

639615345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42641031.

The product of its digits is 291600, while the sum is 42.

The square root of 639615345 is about 25290.6177267381. The cubic root of 639615345 is about 861.6011926468.

The spelling of 639615345 in words is "six hundred thirty-nine million, six hundred fifteen thousand, three hundred forty-five".