65999378 has 8 divisors (see below), whose sum is σ = 99079740. Its totient is φ = 32972800.

The previous prime is 65999333. The next prime is 65999383. The reversal of 65999378 is 87399956.

65999378 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 47706649 + 18292729 = 6907^2 + 4277^2 .

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

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 3 ways as a sum of consecutive naturals, for example, 10223 + ... + 15378.

Almost surely, 2^65999378 is an apocalyptic number.

65999378 is a deficient number, since it is larger than the sum of its proper divisors (33080362).

65999378 is a wasteful number, since it uses less digits than its factorization.

65999378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26892.

The product of its digits is 3674160, while the sum is 56.

The square root of 65999378 is about 8124.0001230921. Note that the first 3 decimals coincide. The cubic root of 65999378 is about 404.1227325374.

The spelling of 65999378 in words is "sixty-five million, nine hundred ninety-nine thousand, three hundred seventy-eight".