64985990 has 16 divisors (see below), whose sum is σ = 117089280. Its totient is φ = 25968960.

The previous prime is 64985983. The next prime is 64986011. The reversal of 64985990 is 9958946.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 10250 + ... + 15330.

It is an arithmetic number, because the mean of its divisors is an integer number (7318080).

Almost surely, 2^64985990 is an apocalyptic number.

64985990 is a deficient number, since it is larger than the sum of its proper divisors (52103290).

64985990 is a wasteful number, since it uses less digits than its factorization.

64985990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6367.

The product of its (nonzero) digits is 699840, while the sum is 50.

The square root of 64985990 is about 8061.3888381593. The cubic root of 64985990 is about 402.0436864151.

The spelling of 64985990 in words is "sixty-four million, nine hundred eighty-five thousand, nine hundred ninety".