64704821 has 2 divisors, whose sum is σ = 64704822. Its totient is φ = 64704820.

The previous prime is 64704811. The next prime is 64704833. The reversal of 64704821 is 12840746.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38068900 + 26635921 = 6170^2 + 5161^2 .

It is a cyclic number.

It is not a de Polignac number, because 64704821 - 2²² = 60510517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64704811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32352410 + 32352411.

It is an arithmetic number, because the mean of its divisors is an integer number (32352411).

Almost surely, 2^64704821 is an apocalyptic number.

It is an amenable number.

64704821 is a deficient number, since it is larger than the sum of its proper divisors (1).

64704821 is an equidigital number, since it uses as much as digits as its factorization.

64704821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10752, while the sum is 32.

The square root of 64704821 is about 8043.9306933862. The cubic root of 64704821 is about 401.4630194943.

The spelling of 64704821 in words is "sixty-four million, seven hundred four thousand, eight hundred twenty-one".