163236478 has 4 divisors (see below), whose sum is σ = 244854720. Its totient is φ = 81618238.

The previous prime is 163236461. The next prime is 163236517. The reversal of 163236478 is 874632361.

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

It is a super-2 number, since 2×163236478² = 53292295499688968, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 163236478.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40809118 + ... + 40809121.

It is an arithmetic number, because the mean of its divisors is an integer number (61213680).

Almost surely, 2^163236478 is an apocalyptic number.

163236478 is a deficient number, since it is larger than the sum of its proper divisors (81618242).

163236478 is an equidigital number, since it uses as much as digits as its factorization.

163236478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81618241.

The product of its digits is 145152, while the sum is 40.

The square root of 163236478 is about 12776.4031714720. The cubic root of 163236478 is about 546.5195959878.

It can be divided in two parts, 16323 and 6478, that added together give a square (22801 = 151²).

The spelling of 163236478 in words is "one hundred sixty-three million, two hundred thirty-six thousand, four hundred seventy-eight".