161864528 has 40 divisors (see below), whose sum is σ = 360036480. Its totient is φ = 69056640.

The previous prime is 161864471. The next prime is 161864551. The reversal of 161864528 is 825468161.

161864528 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-5 number, since 5×161864528⁵ (a number of 42 digits) contains 55555 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22493 + ... + 28803.

It is an arithmetic number, because the mean of its divisors is an integer number (9000912).

Almost surely, 2^161864528 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161864528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (180018240).

161864528 is an abundant number, since it is smaller than the sum of its proper divisors (198171952).

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

161864528 is a wasteful number, since it uses less digits than its factorization.

161864528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6555 (or 6549 counting only the distinct ones).

The product of its digits is 92160, while the sum is 41.

The square root of 161864528 is about 12722.5991055287. The cubic root of 161864528 is about 544.9841793236.

The spelling of 161864528 in words is "one hundred sixty-one million, eight hundred sixty-four thousand, five hundred twenty-eight".