64629921 has 8 divisors (see below), whose sum is σ = 86300704. Its totient is φ = 43022880.

The previous prime is 64629913. The next prime is 64629923. The reversal of 64629921 is 12992646.

64629921 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 64629921 - 2³ = 64629913 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 64629921.

It is not an unprimeable number, because it can be changed into a prime (64629923) by changing a digit.

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, 13516 + ... + 17661.

It is an arithmetic number, because the mean of its divisors is an integer number (10787588).

Almost surely, 2^64629921 is an apocalyptic number.

It is an amenable number.

64629921 is a deficient number, since it is larger than the sum of its proper divisors (21670783).

64629921 is a wasteful number, since it uses less digits than its factorization.

64629921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31871.

The product of its digits is 46656, while the sum is 39.

The square root of 64629921 is about 8039.2736612209. The cubic root of 64629921 is about 401.3080532458.

The spelling of 64629921 in words is "sixty-four million, six hundred twenty-nine thousand, nine hundred twenty-one".