378878817 has 4 divisors (see below), whose sum is σ = 505171760. Its totient is φ = 252585876.

The previous prime is 378878809. The next prime is 378878849. The reversal of 378878817 is 718878873.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 378878817 - 2³ = 378878809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (378878917) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63146467 + ... + 63146472.

It is an arithmetic number, because the mean of its divisors is an integer number (126292940).

Almost surely, 2^378878817 is an apocalyptic number.

It is an amenable number.

378878817 is a deficient number, since it is larger than the sum of its proper divisors (126292943).

378878817 is a wasteful number, since it uses less digits than its factorization.

378878817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126292942.

The product of its digits is 4214784, while the sum is 57.

The square root of 378878817 is about 19464.8097088053. The cubic root of 378878817 is about 723.6025826032.

The spelling of 378878817 in words is "three hundred seventy-eight million, eight hundred seventy-eight thousand, eight hundred seventeen".