63866408 has 8 divisors (see below), whose sum is σ = 119749530. Its totient is φ = 31933200.

The previous prime is 63866371. The next prime is 63866419. The reversal of 63866408 is 80466836.

It can be written as a sum of positive squares in only one way, i.e., 58400164 + 5466244 = 7642^2 + 2338^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3991643 + ... + 3991658.

Almost surely, 2^63866408 is an apocalyptic number.

It is an amenable number.

63866408 is a deficient number, since it is larger than the sum of its proper divisors (55883122).

63866408 is a wasteful number, since it uses less digits than its factorization.

63866408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7983307 (or 7983303 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 41.

The square root of 63866408 is about 7991.6461383122. The cubic root of 63866408 is about 399.7214894580.

The spelling of 63866408 in words is "sixty-three million, eight hundred sixty-six thousand, four hundred eight".