63620821 has 16 divisors (see below), whose sum is σ = 71124480. Its totient is φ = 56420080.

The previous prime is 63620803. The next prime is 63620827. The reversal of 63620821 is 12802636.

It is a cyclic number.

It is not a de Polignac number, because 63620821 - 2⁵ = 63620789 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 63620821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63620827) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 108090 + ... + 108676.

It is an arithmetic number, because the mean of its divisors is an integer number (4445280).

Almost surely, 2^63620821 is an apocalyptic number.

It is an amenable number.

63620821 is a deficient number, since it is larger than the sum of its proper divisors (7503659).

63620821 is a wasteful number, since it uses less digits than its factorization.

63620821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 824.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 63620821 is about 7976.2661063934. The cubic root of 63620821 is about 399.2084785175.

The spelling of 63620821 in words is "sixty-three million, six hundred twenty thousand, eight hundred twenty-one".