63920621 has 4 divisors (see below), whose sum is σ = 63943200. Its totient is φ = 63898044.

The previous prime is 63920609. The next prime is 63920627. The reversal of 63920621 is 12602936.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 63920621 - 2¹⁸ = 63658477 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63920627) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6311 + ... + 12948.

It is an arithmetic number, because the mean of its divisors is an integer number (15985800).

Almost surely, 2^63920621 is an apocalyptic number.

It is an amenable number.

63920621 is a deficient number, since it is larger than the sum of its proper divisors (22579).

63920621 is a wasteful number, since it uses less digits than its factorization.

63920621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22578.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 63920621 is about 7995.0372732089. The cubic root of 63920621 is about 399.8345586657.

The spelling of 63920621 in words is "sixty-three million, nine hundred twenty thousand, six hundred twenty-one".