65667378 has 32 divisors (see below), whose sum is σ = 154157184. Its totient is φ = 18254592.

The previous prime is 65667367. The next prime is 65667383. The reversal of 65667378 is 87376656.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19575 + ... + 22682.

It is an arithmetic number, because the mean of its divisors is an integer number (4817412).

Almost surely, 2^65667378 is an apocalyptic number.

65667378 is an abundant number, since it is smaller than the sum of its proper divisors (88489806).

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

65667378 is a wasteful number, since it uses less digits than its factorization.

65667378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42306.

The product of its digits is 1270080, while the sum is 48.

The square root of 65667378 is about 8103.5410778252. The cubic root of 65667378 is about 403.4439667972.

The spelling of 65667378 in words is "sixty-five million, six hundred sixty-seven thousand, three hundred seventy-eight".