163378 has 4 divisors (see below), whose sum is σ = 245070. Its totient is φ = 81688.

The previous prime is 163367. The next prime is 163393. The reversal of 163378 is 873361.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 873361 = 433 ⋅2017.

It can be written as a sum of positive squares in only one way, i.e., 104329 + 59049 = 323^2 + 243^2 .

It is an unprimeable number.

163378 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40843 + ... + 40846.

2¹⁶³³⁷⁸ is an apocalyptic number.

163378 is a deficient number, since it is larger than the sum of its proper divisors (81692).

163378 is an equidigital number, since it uses as much as digits as its factorization.

163378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81691.

The product of its digits is 3024, while the sum is 28.

The square root of 163378 is about 404.2004453239. The cubic root of 163378 is about 54.6677490036.

It can be divided in two parts, 1633 and 78, that added together give a triangular number (1711 = T₅₈).

The spelling of 163378 in words is "one hundred sixty-three thousand, three hundred seventy-eight".