63865812 has 24 divisors (see below), whose sum is σ = 150908800. Its totient is φ = 21018816.

The previous prime is 63865799. The next prime is 63865817. The reversal of 63865812 is 21856836.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63865817) 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, 32737 + ... + 34632.

Almost surely, 2^63865812 is an apocalyptic number.

It is an amenable number.

63865812 is an abundant number, since it is smaller than the sum of its proper divisors (87042988).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

63865812 is a wasteful number, since it uses less digits than its factorization.

63865812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67455 (or 67453 counting only the distinct ones).

The product of its digits is 69120, while the sum is 39.

The square root of 63865812 is about 7991.6088492869. The cubic root of 63865812 is about 399.7202460566.

The spelling of 63865812 in words is "sixty-three million, eight hundred sixty-five thousand, eight hundred twelve".