161878064 has 20 divisors (see below), whose sum is σ = 318956520. Its totient is φ = 79566720.

The previous prime is 161878061. The next prime is 161878069. The reversal of 161878064 is 460878161.

It is not an unprimeable number, because it can be changed into a prime (161878061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84797 + ... + 86684.

It is an arithmetic number, because the mean of its divisors is an integer number (15947826).

Almost surely, 2^161878064 is an apocalyptic number.

It is an amenable number.

161878064 is a deficient number, since it is larger than the sum of its proper divisors (157078456).

161878064 is a wasteful number, since it uses less digits than its factorization.

161878064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171548 (or 171542 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 41.

The square root of 161878064 is about 12723.1310611814. The cubic root of 161878064 is about 544.9993704226. Note that the first 3 decimals are identical.

The spelling of 161878064 in words is "one hundred sixty-one million, eight hundred seventy-eight thousand, sixty-four".