161290044 has 36 divisors (see below), whose sum is σ = 408189600. Its totient is φ = 53699520.

The previous prime is 161290043. The next prime is 161290057. The reversal of 161290044 is 440092161.

161290044 is a `hidden beast` number, since 1 + 612 + 9 + 0 + 0 + 44 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161290043) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35629 + ... + 39899.

It is an arithmetic number, because the mean of its divisors is an integer number (11338600).

Almost surely, 2^161290044 is an apocalyptic number.

It is an amenable number.

161290044 is an abundant number, since it is smaller than the sum of its proper divisors (246899556).

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

161290044 is a wasteful number, since it uses less digits than its factorization.

161290044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5330 (or 5325 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 161290044 is about 12700.0017322833. The cubic root of 161290044 is about 544.3386686947.

The spelling of 161290044 in words is "one hundred sixty-one million, two hundred ninety thousand, forty-four".