63944905 has 8 divisors (see below), whose sum is σ = 81247752. Its totient is φ = 48146688.

The previous prime is 63944893. The next prime is 63944911. The reversal of 63944905 is 50944936.

It can be written as a sum of positive squares in 4 ways, for example, as 27499536 + 36445369 = 5244^2 + 6037^2 .

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 63944905 - 2⁵ = 63944873 is a prime.

It is a Duffinian number.

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, 376062 + ... + 376231.

It is an arithmetic number, because the mean of its divisors is an integer number (10155969).

Almost surely, 2^63944905 is an apocalyptic number.

It is an amenable number.

63944905 is a deficient number, since it is larger than the sum of its proper divisors (17302847).

63944905 is a wasteful number, since it uses less digits than its factorization.

63944905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 752315.

The product of its (nonzero) digits is 116640, while the sum is 40.

The square root of 63944905 is about 7996.5558211020. Note that the first 3 decimals coincide. The cubic root of 63944905 is about 399.8851857974.

The spelling of 63944905 in words is "sixty-three million, nine hundred forty-four thousand, nine hundred five".