161784072 has 36 divisors (see below), whose sum is σ = 438457695. Its totient is φ = 53892048.

The previous prime is 161784061. The next prime is 161784101. The reversal of 161784072 is 270487161.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in only one way, i.e., 80892036 + 80892036 = 8994^2 + 8994^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=8994.

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

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 107179 + ... + 108677.

Almost surely, 2^161784072 is an apocalyptic number.

161784072 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

161784072 is an abundant number, since it is smaller than the sum of its proper divisors (276673623).

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

161784072 is an equidigital number, since it uses as much as digits as its factorization.

161784072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3010 (or 1504 counting only the distinct ones).

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

The square root of 161784072 is about 12719.4367799836. The cubic root of 161784072 is about 544.8938681756.

The spelling of 161784072 in words is "one hundred sixty-one million, seven hundred eighty-four thousand, seventy-two".