64326821 has 8 divisors (see below), whose sum is σ = 69500760. Its totient is φ = 59185152.

The previous prime is 64326817. The next prime is 64326841. The reversal of 64326821 is 12862346.

It can be written as a sum of positive squares in 4 ways, for example, as 12285025 + 52041796 = 3505^2 + 7214^2 .

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

It is not a de Polignac number, because 64326821 - 2² = 64326817 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64326841) 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, 3836 + ... + 11973.

It is an arithmetic number, because the mean of its divisors is an integer number (8687595).

Almost surely, 2^64326821 is an apocalyptic number.

It is an amenable number.

64326821 is a deficient number, since it is larger than the sum of its proper divisors (5173939).

64326821 is a wasteful number, since it uses less digits than its factorization.

64326821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16135.

The product of its digits is 13824, while the sum is 32.

The square root of 64326821 is about 8020.4003017306. The cubic root of 64326821 is about 400.6797213762.

The spelling of 64326821 in words is "sixty-four million, three hundred twenty-six thousand, eight hundred twenty-one".