64878065 has 16 divisors (see below), whose sum is σ = 93659520. Its totient is φ = 42145920.

The previous prime is 64878061. The next prime is 64878083. The reversal of 64878065 is 56087846.

It is not a de Polignac number, because 64878065 - 2² = 64878061 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (64878061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48116 + ... + 49445.

It is an arithmetic number, because the mean of its divisors is an integer number (5853720).

Almost surely, 2^64878065 is an apocalyptic number.

It is an amenable number.

64878065 is a deficient number, since it is larger than the sum of its proper divisors (28781455).

64878065 is a wasteful number, since it uses less digits than its factorization.

64878065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97592.

The product of its (nonzero) digits is 322560, while the sum is 44.

The square root of 64878065 is about 8054.6921108134. The cubic root of 64878065 is about 401.8209994060.

The spelling of 64878065 in words is "sixty-four million, eight hundred seventy-eight thousand, sixty-five".