161304564 has 24 divisors (see below), whose sum is σ = 384386688. Its totient is φ = 52624000.

The previous prime is 161304541. The next prime is 161304667. The reversal of 161304564 is 465403161.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 142437 + ... + 143564.

It is an arithmetic number, because the mean of its divisors is an integer number (16016112).

Almost surely, 2^161304564 is an apocalyptic number.

It is an amenable number.

161304564 is an abundant number, since it is smaller than the sum of its proper divisors (223082124).

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

161304564 is a wasteful number, since it uses less digits than its factorization.

161304564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286055 (or 286053 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 161304564 is about 12700.5733728836. The cubic root of 161304564 is about 544.3550027475.

The spelling of 161304564 in words is "one hundred sixty-one million, three hundred four thousand, five hundred sixty-four".