161874720 has 384 divisors, whose sum is σ = 666247680. Its totient is φ = 35942400.

The previous prime is 161874719. The next prime is 161874733. The reversal of 161874720 is 27478161.

161874720 is a `hidden beast` number, since 1 + 6 + 187 + 472 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1602670 + ... + 1602770.

It is an arithmetic number, because the mean of its divisors is an integer number (1735020).

Almost surely, 2^161874720 is an apocalyptic number.

161874720 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 161874720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (333123840).

161874720 is an abundant number, since it is smaller than the sum of its proper divisors (504372960).

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

161874720 is a wasteful number, since it uses less digits than its factorization.

161874720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185 (or 171 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 36.

The square root of 161874720 is about 12722.9996463098. Note that the first 3 decimals coincide. The cubic root of 161874720 is about 544.9956176176.

The spelling of 161874720 in words is "one hundred sixty-one million, eight hundred seventy-four thousand, seven hundred twenty".