63408621 has 4 divisors (see below), whose sum is σ = 84544832. Its totient is φ = 42272412.

The previous prime is 63408619. The next prime is 63408629. The reversal of 63408621 is 12680436.

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 not a de Polignac number, because 63408621 - 2¹ = 63408619 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63408629) 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, 10568101 + ... + 10568106.

It is an arithmetic number, because the mean of its divisors is an integer number (21136208).

Almost surely, 2^63408621 is an apocalyptic number.

It is an amenable number.

63408621 is a deficient number, since it is larger than the sum of its proper divisors (21136211).

63408621 is a wasteful number, since it uses less digits than its factorization.

63408621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21136210.

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 63408621 is about 7962.9530326381. The cubic root of 63408621 is about 398.7641460114.

The spelling of 63408621 in words is "sixty-three million, four hundred eight thousand, six hundred twenty-one".