378878165 has 4 divisors (see below), whose sum is σ = 454653804. Its totient is φ = 303102528.

The previous prime is 378878153. The next prime is 378878173. The reversal of 378878165 is 561878873.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 209409841 + 169468324 = 14471^2 + 13018^2 .

It is a cyclic number.

It is not a de Polignac number, because 378878165 - 2¹⁴ = 378861781 is a prime.

It is a super-3 number, since 3×378878165³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37887812 + ... + 37887821.

It is an arithmetic number, because the mean of its divisors is an integer number (113663451).

Almost surely, 2^378878165 is an apocalyptic number.

It is an amenable number.

378878165 is a deficient number, since it is larger than the sum of its proper divisors (75775639).

378878165 is an equidigital number, since it uses as much as digits as its factorization.

378878165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75775638.

The product of its digits is 2257920, while the sum is 53.

The square root of 378878165 is about 19464.7929606251. The cubic root of 378878165 is about 723.6021675284.

The spelling of 378878165 in words is "three hundred seventy-eight million, eight hundred seventy-eight thousand, one hundred sixty-five".