161378276 has 12 divisors (see below), whose sum is σ = 282549372. Its totient is φ = 80649888.

The previous prime is 161378227. The next prime is 161378291. The reversal of 161378276 is 672873161.

It can be written as a sum of positive squares in 2 ways, for example, as 26214400 + 135163876 = 5120^2 + 11626^2 .

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 in 3 ways as a sum of consecutive naturals, for example, 686 + ... + 17978.

It is an arithmetic number, because the mean of its divisors is an integer number (23545781).

Almost surely, 2^161378276 is an apocalyptic number.

It is an amenable number.

161378276 is a deficient number, since it is larger than the sum of its proper divisors (121171096).

161378276 is a wasteful number, since it uses less digits than its factorization.

161378276 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19630 (or 19628 counting only the distinct ones).

The product of its digits is 84672, while the sum is 41.

The square root of 161378276 is about 12703.4749576641. The cubic root of 161378276 is about 544.4379088237.

It can be divided in two parts, 16 and 1378276, that multiplied together give a square (22052416 = 4696²).

The spelling of 161378276 in words is "one hundred sixty-one million, three hundred seventy-eight thousand, two hundred seventy-six".