161242704 has 160 divisors (see below), whose sum is σ = 537108480. Its totient is φ = 45360000.

The previous prime is 161242681. The next prime is 161242723. The reversal of 161242704 is 407242161.

161242704 is a `hidden beast` number, since 1 + 612 + 42 + 7 + 0 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 214329 + ... + 215079.

It is an arithmetic number, because the mean of its divisors is an integer number (3356928).

Almost surely, 2^161242704 is an apocalyptic number.

161242704 is a gapful number since it is divisible by the number (14) 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 161242704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (268554240).

161242704 is an abundant number, since it is smaller than the sum of its proper divisors (375865776).

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

161242704 is a wasteful number, since it uses less digits than its factorization.

161242704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 846 (or 834 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 161242704 is about 12698.1378162312. The cubic root of 161242704 is about 544.2854074735.

Adding to 161242704 its reverse (407242161), we get a palindrome (568484865).

The spelling of 161242704 in words is "one hundred sixty-one million, two hundred forty-two thousand, seven hundred four".