378817671 has 4 divisors (see below), whose sum is σ = 505090232. Its totient is φ = 252545112.

The previous prime is 378817669. The next prime is 378817693. The reversal of 378817671 is 176718873.

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

It is not a de Polignac number, because 378817671 - 2¹ = 378817669 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 378817671.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (378817601) 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 3 ways as a sum of consecutive naturals, for example, 63136276 + ... + 63136281.

It is an arithmetic number, because the mean of its divisors is an integer number (126272558).

Almost surely, 2^378817671 is an apocalyptic number.

378817671 is a deficient number, since it is larger than the sum of its proper divisors (126272561).

378817671 is a wasteful number, since it uses less digits than its factorization.

378817671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126272560.

The product of its digits is 395136, while the sum is 48.

The square root of 378817671 is about 19463.2389647766. The cubic root of 378817671 is about 723.5636538992.

The spelling of 378817671 in words is "three hundred seventy-eight million, eight hundred seventeen thousand, six hundred seventy-one".