64821587 has 2 divisors, whose sum is σ = 64821588. Its totient is φ = 64821586.

The previous prime is 64821571. The next prime is 64821593. The reversal of 64821587 is 78512846.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64821587 - 2⁴ = 64821571 is a prime.

It is not a weakly prime, because it can be changed into another prime (64821517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32410793 + 32410794.

It is an arithmetic number, because the mean of its divisors is an integer number (32410794).

Almost surely, 2^64821587 is an apocalyptic number.

64821587 is a deficient number, since it is larger than the sum of its proper divisors (1).

64821587 is an equidigital number, since it uses as much as digits as its factorization.

64821587 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 107520, while the sum is 41.

The square root of 64821587 is about 8051.1854406665. The cubic root of 64821587 is about 401.7043671008.

The spelling of 64821587 in words is "sixty-four million, eight hundred twenty-one thousand, five hundred eighty-seven".