161878152 has 32 divisors (see below), whose sum is σ = 413308800. Its totient is φ = 52810944.

The previous prime is 161878139. The next prime is 161878169. The reversal of 161878152 is 251878161.

It is a self number, because there is not a number n which added to its sum of digits gives 161878152.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70627 + ... + 72882.

It is an arithmetic number, because the mean of its divisors is an integer number (12915900).

Almost surely, 2^161878152 is an apocalyptic number.

161878152 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

161878152 is an abundant number, since it is smaller than the sum of its proper divisors (251430648).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161878152 is a wasteful number, since it uses less digits than its factorization.

161878152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143565 (or 143561 counting only the distinct ones).

The product of its digits is 26880, while the sum is 39.

The square root of 161878152 is about 12723.1345194492. The cubic root of 161878152 is about 544.9994691800. Note that the first 3 decimals are identical.

Subtracting 161878152 from its reverse (251878161), we obtain a palindrome (90000009).

The spelling of 161878152 in words is "one hundred sixty-one million, eight hundred seventy-eight thousand, one hundred fifty-two".