64341821 has 4 divisors (see below), whose sum is σ = 68126652. Its totient is φ = 60556992.

The previous prime is 64341817. The next prime is 64341839. The reversal of 64341821 is 12814346.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 23522500 + 40819321 = 4850^2 + 6389^2 .

It is not a de Polignac number, because 64341821 - 2² = 64341817 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 (64341881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1892390 + ... + 1892423.

It is an arithmetic number, because the mean of its divisors is an integer number (17031663).

Almost surely, 2^64341821 is an apocalyptic number.

It is an amenable number.

64341821 is a deficient number, since it is larger than the sum of its proper divisors (3784831).

64341821 is a wasteful number, since it uses less digits than its factorization.

64341821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3784830.

The product of its digits is 4608, while the sum is 29.

The square root of 64341821 is about 8021.3353626438. The cubic root of 64341821 is about 400.7108630194.

The spelling of 64341821 in words is "sixty-four million, three hundred forty-one thousand, eight hundred twenty-one".