64616421 has 8 divisors (see below), whose sum is σ = 86230144. Its totient is φ = 43040160.

The previous prime is 64616417. The next prime is 64616441. The reversal of 64616421 is 12461646.

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

It is not a de Polignac number, because 64616421 - 2² = 64616417 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 (64616411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5056 + ... + 12441.

It is an arithmetic number, because the mean of its divisors is an integer number (10778768).

Almost surely, 2^64616421 is an apocalyptic number.

It is an amenable number.

64616421 is a deficient number, since it is larger than the sum of its proper divisors (21613723).

64616421 is a wasteful number, since it uses less digits than its factorization.

64616421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18731.

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

The square root of 64616421 is about 8038.4339892793. The cubic root of 64616421 is about 401.2801093466.

The spelling of 64616421 in words is "sixty-four million, six hundred sixteen thousand, four hundred twenty-one".