64945999 has 8 divisors (see below), whose sum is σ = 65478672. Its totient is φ = 64416000.

The previous prime is 64945987. The next prime is 64946027. The reversal of 64945999 is 99954946.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 64945999 - 2⁷ = 64945871 is a prime.

It is a super-2 number, since 2×64945999² = 8435965572216002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64945919) 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, 88237 + ... + 88969.

It is an arithmetic number, because the mean of its divisors is an integer number (8184834).

Almost surely, 2^64945999 is an apocalyptic number.

64945999 is a deficient number, since it is larger than the sum of its proper divisors (532673).

64945999 is a wasteful number, since it uses less digits than its factorization.

64945999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1337.

The product of its digits is 3149280, while the sum is 55.

The square root of 64945999 is about 8058.9080525838. The cubic root of 64945999 is about 401.9611997733.

The spelling of 64945999 in words is "sixty-four million, nine hundred forty-five thousand, nine hundred ninety-nine".