64878879 has 16 divisors (see below), whose sum is σ = 93536352. Its totient is φ = 39763968.

The previous prime is 64878841. The next prime is 64878889. The reversal of 64878879 is 97887846.

It is not a de Polignac number, because 64878879 - 2⁹ = 64878367 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64878889) 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, 6787 + ... + 13259.

It is an arithmetic number, because the mean of its divisors is an integer number (5846022).

Almost surely, 2^64878879 is an apocalyptic number.

64878879 is a deficient number, since it is larger than the sum of its proper divisors (28657473).

64878879 is a wasteful number, since it uses less digits than its factorization.

64878879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6746.

The product of its digits is 5419008, while the sum is 57.

The square root of 64878879 is about 8054.7426402089. The cubic root of 64878879 is about 401.8226798966.

The spelling of 64878879 in words is "sixty-four million, eight hundred seventy-eight thousand, eight hundred seventy-nine".