64043986 has 16 divisors (see below), whose sum is σ = 98605440. Its totient is φ = 31182480.

The previous prime is 64043951. The next prime is 64043989. The reversal of 64043986 is 68934046.

It is not an unprimeable number, because it can be changed into a prime (64043989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18220 + ... + 21448.

It is an arithmetic number, because the mean of its divisors is an integer number (6162840).

Almost surely, 2^64043986 is an apocalyptic number.

64043986 is a deficient number, since it is larger than the sum of its proper divisors (34561454).

64043986 is a wasteful number, since it uses less digits than its factorization.

64043986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3489.

The product of its (nonzero) digits is 124416, while the sum is 40.

The square root of 64043986 is about 8002.7486528067. The cubic root of 64043986 is about 400.0916165144.

The spelling of 64043986 in words is "sixty-four million, forty-three thousand, nine hundred eighty-six".