65978886 has 16 divisors (see below), whose sum is σ = 136508400. Its totient is φ = 21234528.

The previous prime is 65978867. The next prime is 65978909. The reversal of 65978886 is 68887956.

65978886 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 189421 + ... + 189768.

It is an arithmetic number, because the mean of its divisors is an integer number (8531775).

Almost surely, 2^65978886 is an apocalyptic number.

65978886 is an abundant number, since it is smaller than the sum of its proper divisors (70529514).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

65978886 is a wasteful number, since it uses less digits than its factorization.

65978886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379223.

The product of its digits is 5806080, while the sum is 57.

The square root of 65978886 is about 8122.7388238204. The cubic root of 65978886 is about 404.0809031519.

The spelling of 65978886 in words is "sixty-five million, nine hundred seventy-eight thousand, eight hundred eighty-six".