64821487 has 2 divisors, whose sum is σ = 64821488. Its totient is φ = 64821486.

The previous prime is 64821457. The next prime is 64821499. The reversal of 64821487 is 78412846.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64821487 - 2⁷ = 64821359 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64821437) 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 as a sum of consecutive naturals, namely, 32410743 + 32410744.

It is an arithmetic number, because the mean of its divisors is an integer number (32410744).

Almost surely, 2^64821487 is an apocalyptic number.

64821487 is a deficient number, since it is larger than the sum of its proper divisors (1).

64821487 is an equidigital number, since it uses as much as digits as its factorization.

64821487 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 86016, while the sum is 40.

The square root of 64821487 is about 8051.1792303985. The cubic root of 64821487 is about 401.7041605315.

The spelling of 64821487 in words is "sixty-four million, eight hundred twenty-one thousand, four hundred eighty-seven".