63436821 has 20 divisors (see below), whose sum is σ = 98684832. Its totient is φ = 36245496.

The previous prime is 63436811. The next prime is 63436837. The reversal of 63436821 is 12863436.

It is not a de Polignac number, because 63436821 - 2⁷ = 63436693 is a prime.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63436811) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2800 + ... + 11606.

Almost surely, 2^63436821 is an apocalyptic number.

It is an amenable number.

63436821 is a deficient number, since it is larger than the sum of its proper divisors (35248011).

63436821 is an frugal number, since it uses more digits than its factorization.

63436821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8838 (or 8817 counting only the distinct ones).

The product of its digits is 20736, while the sum is 33.

The square root of 63436821 is about 7964.7235356916. The cubic root of 63436821 is about 398.8232519716.

The spelling of 63436821 in words is "sixty-three million, four hundred thirty-six thousand, eight hundred twenty-one".