64890587 has 2 divisors, whose sum is σ = 64890588. Its totient is φ = 64890586.

The previous prime is 64890583. The next prime is 64890599. The reversal of 64890587 is 78509846.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64890587 - 2² = 64890583 is a prime.

It is not a weakly prime, because it can be changed into another prime (64890583) 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, 32445293 + 32445294.

It is an arithmetic number, because the mean of its divisors is an integer number (32445294).

Almost surely, 2^64890587 is an apocalyptic number.

64890587 is a deficient number, since it is larger than the sum of its proper divisors (1).

64890587 is an equidigital number, since it uses as much as digits as its factorization.

64890587 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 483840, while the sum is 47.

The square root of 64890587 is about 8055.4693842134. The cubic root of 64890587 is about 401.8468493286.

The spelling of 64890587 in words is "sixty-four million, eight hundred ninety thousand, five hundred eighty-seven".