161616028 has 24 divisors (see below), whose sum is σ = 323545824. Its totient is φ = 69196800.

The previous prime is 161616019. The next prime is 161616029. The reversal of 161616028 is 820616161.

It is a super-2 number, since 2×161616028² = 52239481012993568, which contains 22 as substring.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161616029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35988 + ... + 40228.

It is an arithmetic number, because the mean of its divisors is an integer number (13481076).

Almost surely, 2^161616028 is an apocalyptic number.

It is an amenable number.

161616028 is an abundant number, since it is smaller than the sum of its proper divisors (161929796).

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

161616028 is a wasteful number, since it uses less digits than its factorization.

161616028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5613 (or 5611 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 161616028 is about 12712.8292681055. The cubic root of 161616028 is about 544.7051436504.

The spelling of 161616028 in words is "one hundred sixty-one million, six hundred sixteen thousand, twenty-eight".