64395021 has 8 divisors (see below), whose sum is σ = 86171104. Its totient is φ = 42774480.

The previous prime is 64395017. The next prime is 64395043. The reversal of 64395021 is 12059346.

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

It is not a de Polignac number, because 64395021 - 2² = 64395017 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 64395021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64395011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37915 + ... + 39576.

It is an arithmetic number, because the mean of its divisors is an integer number (10771388).

Almost surely, 2^64395021 is an apocalyptic number.

It is an amenable number.

64395021 is a deficient number, since it is larger than the sum of its proper divisors (21776083).

64395021 is a wasteful number, since it uses less digits than its factorization.

64395021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77771.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 64395021 is about 8024.6508335254. The cubic root of 64395021 is about 400.8212730391.

The spelling of 64395021 in words is "sixty-four million, three hundred ninety-five thousand, twenty-one".