63906643 has 8 divisors (see below), whose sum is σ = 65596608. Its totient is φ = 62226024.

The previous prime is 63906641. The next prime is 63906649. The reversal of 63906643 is 34660936.

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

It is a cyclic number.

It is not a de Polignac number, because 63906643 - 2¹ = 63906641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63906641) 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, 12780 + ... + 17062.

It is an arithmetic number, because the mean of its divisors is an integer number (8199576).

Almost surely, 2^63906643 is an apocalyptic number.

63906643 is a deficient number, since it is larger than the sum of its proper divisors (1689965).

63906643 is a wasteful number, since it uses less digits than its factorization.

63906643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4673.

The product of its (nonzero) digits is 69984, while the sum is 37.

The square root of 63906643 is about 7994.1630581319. The cubic root of 63906643 is about 399.8054116037.

The spelling of 63906643 in words is "sixty-three million, nine hundred six thousand, six hundred forty-three".