64890115 has 4 divisors (see below), whose sum is σ = 77868144. Its totient is φ = 51912088.

The previous prime is 64890113. The next prime is 64890143. The reversal of 64890115 is 51109846.

64890115 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 64890115 - 2¹ = 64890113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64890113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6489007 + ... + 6489016.

It is an arithmetic number, because the mean of its divisors is an integer number (19467036).

Almost surely, 2^64890115 is an apocalyptic number.

64890115 is a deficient number, since it is larger than the sum of its proper divisors (12978029).

64890115 is a wasteful number, since it uses less digits than its factorization.

64890115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12978028.

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 64890115 is about 8055.4400872950. The cubic root of 64890115 is about 401.8458750108.

The spelling of 64890115 in words is "sixty-four million, eight hundred ninety thousand, one hundred fifteen".