378720561 has 8 divisors (see below), whose sum is σ = 506585664. Its totient is φ = 251667920.

The previous prime is 378720547. The next prime is 378720593. The reversal of 378720561 is 165027873.

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

It is a cyclic number.

It is not a de Polignac number, because 378720561 - 2⁶ = 378720497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (378720361) by changing a digit.

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, 202026 + ... + 203891.

It is an arithmetic number, because the mean of its divisors is an integer number (63323208).

Almost surely, 2^378720561 is an apocalyptic number.

It is an amenable number.

378720561 is a deficient number, since it is larger than the sum of its proper divisors (127865103).

378720561 is a wasteful number, since it uses less digits than its factorization.

378720561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406231.

The product of its (nonzero) digits is 70560, while the sum is 39.

The square root of 378720561 is about 19460.7441019094. The cubic root of 378720561 is about 723.5018200436.

The spelling of 378720561 in words is "three hundred seventy-eight million, seven hundred twenty thousand, five hundred sixty-one".