64449994 has 12 divisors (see below), whose sum is σ = 112458834. Its totient is φ = 27621384.

The previous prime is 64449943. The next prime is 64449997. The reversal of 64449994 is 49994446.

It can be written as a sum of positive squares in only one way, i.e., 58752225 + 5697769 = 7665^2 + 2387^2 .

It is a Harshad number since it is a multiple of its sum of digits (49).

It is not an unprimeable number, because it can be changed into a prime (64449997) 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 in 5 ways as a sum of consecutive naturals, for example, 328729 + ... + 328924.

Almost surely, 2^64449994 is an apocalyptic number.

64449994 is a deficient number, since it is larger than the sum of its proper divisors (48008840).

64449994 is a wasteful number, since it uses less digits than its factorization.

64449994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 657669 (or 657662 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 49.

The square root of 64449994 is about 8028.0753608820. The cubic root of 64449994 is about 400.9352988357.

The spelling of 64449994 in words is "sixty-four million, four hundred forty-nine thousand, nine hundred ninety-four".