161178240 has 128 divisors (see below), whose sum is σ = 518584320. Its totient is φ = 42577920.

The previous prime is 161178229. The next prime is 161178271. The reversal of 161178240 is 42871161.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 161178198 and 161178207.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 243510 + ... + 244170.

It is an arithmetic number, because the mean of its divisors is an integer number (4051440).

Almost surely, 2^161178240 is an apocalyptic number.

161178240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161178240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (259292160).

161178240 is an abundant number, since it is smaller than the sum of its proper divisors (357406080).

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

161178240 is a wasteful number, since it uses less digits than its factorization.

161178240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 810 (or 798 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 30.

The square root of 161178240 is about 12695.5992375311. The cubic root of 161178240 is about 544.2128636405.

The spelling of 161178240 in words is "one hundred sixty-one million, one hundred seventy-eight thousand, two hundred forty".