63621645 has 8 divisors (see below), whose sum is σ = 101794656. Its totient is φ = 33931536.

The previous prime is 63621619. The next prime is 63621661. The reversal of 63621645 is 54612636.

63621645 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 63621645 - 2⁹ = 63621133 is a prime.

It is a super-3 number, since 3×63621645³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2120707 + ... + 2120736.

It is an arithmetic number, because the mean of its divisors is an integer number (12724332).

Almost surely, 2^63621645 is an apocalyptic number.

It is an amenable number.

63621645 is a deficient number, since it is larger than the sum of its proper divisors (38173011).

63621645 is a wasteful number, since it uses less digits than its factorization.

63621645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4241451.

The product of its digits is 25920, while the sum is 33.

The square root of 63621645 is about 7976.3177594677. The cubic root of 63621645 is about 399.2102019908.

Subtracting from 63621645 its reverse (54612636), we obtain a palindrome (9009009).

The spelling of 63621645 in words is "sixty-three million, six hundred twenty-one thousand, six hundred forty-five".