378668891 has 16 divisors (see below), whose sum is σ = 390394368. Its totient is φ = 367200000.

The previous prime is 378668887. The next prime is 378668893. The reversal of 378668891 is 198866873.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 378668891 - 2² = 378668887 is a prime.

It is a super-2 number, since 2×378668891² = 286780258022339762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (378668893) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1508516 + ... + 1508766.

It is an arithmetic number, because the mean of its divisors is an integer number (24399648).

Almost surely, 2^378668891 is an apocalyptic number.

378668891 is a deficient number, since it is larger than the sum of its proper divisors (11725477).

378668891 is a wasteful number, since it uses less digits than its factorization.

378668891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 602.

The product of its digits is 3483648, while the sum is 56.

The square root of 378668891 is about 19459.4165123212. The cubic root of 378668891 is about 723.4689153613.

The spelling of 378668891 in words is "three hundred seventy-eight million, six hundred sixty-eight thousand, eight hundred ninety-one".